I am absolutely delighted that Jason has built several videos from one pothole destroying his odd-sized Tesla wheel.
@EngineeringExplained3 жыл бұрын
Gift that keeps on giving!
@kiranmuraleekrishnan3 жыл бұрын
i was thinking the same..
@sleepy_Dragon3 жыл бұрын
Somehow he has to get the money back.
@rickashcroft82263 жыл бұрын
Question: shouldn't the comparison be made based on the rolling diameter of the tire rather tha wheel diameter? If the smaller wheel/larger tire diameter combination results in a larger exposed tire area, the some of the gains will be reduced or negated.
@bindusaraamitaraghata94203 жыл бұрын
😆😆
@EngineeringExplained3 жыл бұрын
**CLARIFICATION!** Why do bigger wheels mean worse efficiency, when the overall tire diameter remains the same? This comes down to aerodynamics. A 20" wheel will cause more of a disruption in airflow than an 18" wheel. That's why Tesla (and others) uses aero covers on their wheels (Car & Driver testing showed it gives about a 3% efficiency bonus at speed). The smaller the wheel, the more of the side profile of the wheel & tire is perfectly flat (the tire is flat, the wheel is open: more tire = more flat area, less open area). Ideally, you'd have just a plain, solid sheet for the wheel, but obviously that's not idea for brake cooling. Wheel covers are today's common compromise as they have some airflow, but minimal. Let's bring back big sidewalls! Watch till the end to learn how fat sidewalls will save the planet. Car community doing their part. 💪😂
@abrahamvargas65573 жыл бұрын
Is this applicable to internal combuation cars, I would like to know if I can save the environment too 🤔 Edit: Clarification already did
@iNick903 жыл бұрын
Can you do a white board video on how much range you would lose by ricing a Tesla? Spoilers, Canards, 45 degree camber ect. 😂
@mrslcom3 жыл бұрын
Why does bigger wheels by itself hurt EV range or gas mileage?
@mai_kul3 жыл бұрын
I just thought of this. When range testing different size wheels in real life, do people account for the speedometer being slightly off due to the size of the entire tire and wheel?
@paulcet3 жыл бұрын
@@mai_kul If I was range testing a vehicle I would NOT use the speedometer. The range tests are either done with a rolling road or other means of monitoring speed and distance.
@aaronalter20003 жыл бұрын
It's interesting to me that standard wheel sizes have been increasing over the years from all car manufacturers. It seems like it was just for looks, not for ride quality or efficiency.
@shingnosis2 жыл бұрын
On electric and heavy vehicles some of has to do with brake disc size, bigger rims means more room for bigger discs. Another part of it has to do with handling on the limit in heavy vehicles, like when performing evasive maneuvers like the dreaded "moose test" etc. But you are partly right, on some cars it really is just for looks. And many customers would do well NOT to tick those bigger wheel options when ordering a car, I certainly don't.
@aluisious2 жыл бұрын
The size of the vehicles increases too. Also mostly for looks. People drive around in Tundras which are legitimately scarily large with nothing except a handbag with them. They think it looks cool.
@rp96749 ай бұрын
The original premise was handling, as in cornering
@rp96749 ай бұрын
@aluisious that's part of why Bolt EUV is more popular than EV, a little more back seat, but 6 in longer
@peterkauss58529 ай бұрын
Larger tires and wheels also cost more to replace.
@876r876rf3 жыл бұрын
Me: **Looks in bank account**..........**Starts affixing grocery cart wheels to car**
@tmangoodguy99213 жыл бұрын
Extremely underrated comment 😂 If KZfaq had a decent algorithm youd be a top comment
@maschan913 жыл бұрын
I remember a race car engineer saying the ideal wheel size is the smallest you can fit around your brakes.
@andrewsaint65813 жыл бұрын
That's why Tyrell ran a 6 wheel F1 car. It worked so it was banned.
@thecrazyfarmboy3 жыл бұрын
Makes sense to me
@yummyhershey59023 жыл бұрын
@@andrewsaint6581 he didn’t run that for wheel size. He ran it because it increased the overall contract patch of his wheels, which gave him more grip.
@Seb-Storm3 жыл бұрын
@@andrewsaint6581 the 6 wheel car had 4 front small wheels to have better grip and better aero on the upper part being flat but has nothing to do with side walls
@Seb-Storm3 жыл бұрын
@Tamara Maschan true, f1 cars try to use small wheels to some extent. I had a similar experience i raced my stock 325 vs a stock 325 but with big wheels and in the 1/4 it did a small difference
@coscorrodrift3 жыл бұрын
This settles it. I'm calling my crush and telling her that 2 inches less is 15% better, I hope that finally gets her to date me.
@ajaykaushik22723 жыл бұрын
🤣🤣🤣😂😂
@iNick903 жыл бұрын
15% increased thrusts per minute, resulting in 15% faster finishing time. Idk man that still sounds like a bad thing for her
@Blox1173 жыл бұрын
jokes on you, i already told her 0 inches is 100% better
@5roundsrapid2633 жыл бұрын
Shorter, but thicker.
@blubb90043 жыл бұрын
So you sexually identify as a model 3? understandably so.
@yt5306513 жыл бұрын
Tire and wheel size has increased substantially in the last 30 years. People may not remember this, but cars like the 1990 Honda Accord LX and the 1989 Camry (base version) had 14 inch wheels and used 185/70R 14 tires. As indicated by the 70 aspect ratio, those cars had wide sidewalls and the ride they provided was fine. When I bought a new car in Sept. of 2017, I bought a 2017 Camry LE rather than the 2018 model (which was already being sold) in part to avoid the new dual clutch automatic transmission, but also to get the smallest possible wheel size (16 inches) and the largest aspect ratio (65) I could. Even the higher priced 2017 Camry models forced you to get larger wheel sizes. An article in a car magazine I read several years ago included an interview with an auto executive who was asked why manufacturers kept on using bigger wheels despite the various engineering drawbacks, and he replied that it was largely done for styling reasons.
@joshduke13410 ай бұрын
the main driver, I think, of those "styling reasons" is EU pedestrian impact standards that effectively require a very high hood-line, which in turn causes that "blocky" look with tall fenders, which look silly without big wheels. They're trying to make the wheels proportionate to the chunky look of everything else that the pedestrian impact standards force.
@mholmes926210 ай бұрын
I know this is two years old now but hopefully by now you’ve realized the Camry has a traditional slush box 8 speed auto, not a dual clutch as you stated. Sorry it just triggered my inner autist and I had to comment.
@MaximusU769 ай бұрын
Smaller side shoulder of a tire improves sharp steering in contrast to suspension "ride quality". Today middle driver prefers driveability to comfort. Just a business.
@TassieLorenzo7 ай бұрын
This is true. But also follows that wheel and tyre size *decreased* substantially from 1910 to 1960. Wheels went from 36" on a 1910 car, down to 27" or so on a 1915, down to 21" or so on a 1925 and then down to 18" to 17" to 16" or so in the 1940's and then an even smaller 14" to 15" became the fashion in the late 50's and early 60's, to allow for a lower, sleeker profile of the overall vehicle. These 13" and 14" carried through to 1980's economy cars as you say, but then wheels started to grow bigger again as increasingly low profile radials were developed (starting with radials less than S or standard 82% profile, first coming out in the late 60's). The exotic 16" "low profile" 205/55 R16 that was once the preserve of a Porsche 911 front tyre in 1985 is now the standard tyre on the most base model Toyota Corolla, and the 225/40 R18 that was so exotic when it was a Ferrari 355 front tyre in 1998 is now the standard tyre on a higher trim level Corolla! As cars (unfortunately) get taller again more like 1930's cars -- reverting the change to low, sleek, more aerodynamic designs of the 1970's and 1980's -- it makes sense that wheels would get larger again, even if only for stylistic reasons.
@yt5306517 ай бұрын
To: Tassie Lorenzo: Thanks for your informative comment. I was not aware of the historical information that you provided. @@TassieLorenzo
@rstoner883 жыл бұрын
I never realized the impact of intentionally going with 16” cheap tire option rather than the 18”. I’m able to get 40.5 mpg average on a 2.0L focus manual. Watching this video really makes me think that tire choice has a much larger impact on mpg than previously thought.
@potatocupgaming11643 жыл бұрын
Board: *says 0.6* EE: "nearly ONE percent!"
@EngineeringExplained3 жыл бұрын
That's some healthy rounding right there!
@falxonPSN3 жыл бұрын
It's Apple style marketing! This video Jason made is the newest video he has ever produced!
@olegs793 жыл бұрын
More than half at least.
@mychevysparkevdidntcatchfi14893 жыл бұрын
Try it yourself in any program. Even Excel, round(0.6) will give you 1.
@f-s-r3 жыл бұрын
"that's nearly 1.7 times the real value" :D
@DMSparky3 жыл бұрын
Big wheels are pretty much worse all around imo. Without watching the video first, tire are usually more expensive, have worse ride quality, more prone to curb rash and bending a rim on a pot hole. Basically worse in the real world.
@SoulTouchMusic933 жыл бұрын
Yeah but they look cooler tho.
@atarvhegde52103 жыл бұрын
Well wider tyres give you more grip.
@5roundsrapid2633 жыл бұрын
I despise “wagon wheels”. It’s really bad when you put them on a ‘70s/‘80s land yacht and ruin the smooth ride and handling they’re famous for.
@boxr_42143 жыл бұрын
yeah, i've been looking at swapping the brakes on my car so i can fit 15s. it's nice to not worry about potholes and curb rash, plus better rotation in corners with the skinnier tires. efficiency is cool too, i guess.
@AB-yt4hd3 жыл бұрын
@@SoulTouchMusic93 I don't like the look of the slim tires on huge rims.
@jmzorko3 жыл бұрын
Wheel weight also has a lot to do with it (which EE has already made a video about). I had aftermarket 20" wheels (at 35 lbs / wheel) installed on my stealth Model 3 Performance, and my energy usage increased to ~270 wh/m. They looked awesome, but I've been doing a lot of road trips lately and wanted better range. I recently purchased a set of the 19" Tesla sport wheels (at 25 lbs / wheel), and my energy usage is now back to ~240 wh/m - much better :-)
@masimilianzo Жыл бұрын
could you link the video on wheel weight you mentioned? Thanks
@navid8276 Жыл бұрын
What is a stealth Model 3 performance?
@ekbuz11 ай бұрын
@@navid8276 It's a Model 3 that has the big performance motors, but the regular brakes, no spoiler, and no track mode. It's basically a Long Range with bigger motors, so stealthily as fast as a Performance model, but none of the change in looks.
@tofu86oc559 ай бұрын
they should call it model 3 BIG MOTOR then 😅
@awebuser59148 ай бұрын
The weight of the wheel will have _zero_ impact on steady-state range. The only time you'd notice it is when accelerating that mass up to a certain speed, ergo, "road trips" would be the _last_ place you'd ever notice a mass difference.
@PenkillerDIY3 жыл бұрын
Hope you read that. I made allot of calculations for my 3.0 Continental in order to understand how tire pressure is determined. - wanted to use non standard 235/50/19 winter tires and keep rolling resistance, contact patch, etc. to spec. Turned out the required pressure is 2.4 bar - the same as the stock pressure of the stock size 235/50/18 - see why below. 245/40/20 - 2.7 bar cold pressure - ~3.7% sidewall deformation 255/45/19 - 2.3 bar cold pressure ~ 3.8% sidewall deformation Calculation: 1/2 of axle load is divided by pressure, this gives area of contact patch; Area/width of tire gives length; 1/2 length of contact patch is used to solve right angle triangle as one side, second side - hypothenuse is the non deformed radius and the third side is the effective radius of the loaded tire. Substract r-eff from r-nominal you get amount of deformation in mm. Find percentage from sidewall height and that's your percentage of deformation. If you play enough, you'll find out that taller tires allow for less deformation especially if they are tall and wide. For instance, a 2005 Mustang GT on it's stock 235/55/17 would deform them less than 2% at 2.2-2.4 bar cold. Allot of info can be drawn from this simple calculation. And btw, your added air drag calculation is not correct. A wheel has Cd of 1, so your 0.03m2 should be included roughly 4.5 times in the drag of a 0.22 Cd automobile thus contributing to allot more drag than you came with. Best regards! P.S. you seem to never react to my comments.
@comickebs7483 жыл бұрын
Hence the reason why the Prius always had tiny wheels - 15". Cheap stuff that was good stuff.
@5roundsrapid2633 жыл бұрын
The Geo Metro had 13 inch wheels!
@TheCreamRisesToTheTop3 жыл бұрын
And it also makes tires cheap. A set of brand new michelins for my prius was $450 installed
@FFVoyager3 жыл бұрын
I notice the new MG electric cars have good range and small wheels too.
@mincooper3 жыл бұрын
Great video. When moving between the wheel sizes, the bigger wheels may be heavier. If so would that make a difference? Wondering if a 235 tire in 18 stock wheel is more efficient than 235 tire on a lighter (perhaps forged) 20" wheel.
@Tron-Jockey3 жыл бұрын
Hmm, I agree. Same with the early Honda Insights which used a rather small 14" x 5.5" wheel. My 2002 would get between 62 and 64 mpg on the highway everyday but after going with a taller tire I immediately noticed a loss of nearly 5 mpg. Have to stop 2nd guessing Honda engineers.
@MichaelVanBladel3 жыл бұрын
"Lets say you have a very slim tyre, 205" - cries in 175
@stephensmith20273 жыл бұрын
Cries in 165 :(
@laszlobauer52743 жыл бұрын
I have 2 sets, the summer set is the "big" 15 inch 185 tires vs the 13 inch 165 ones on my winter set.
@allwrathnograpes3 жыл бұрын
I had 155s on my Mirage
@jaoliver9993 жыл бұрын
BMW i3 - 155/70-19 and they're only made by Bridgestone
@MattOGormanSmith3 жыл бұрын
145/80-10 Austin Mini . Winner takes all until Chang-Li qualifies as a car
@lowdmedia3 жыл бұрын
Make sidewalls great again!
@Pseudynom3 жыл бұрын
Make sidewalks great again!
@BlueDually4x43 жыл бұрын
As someone that hates 20" wheels on anything, I am glad that math supports smaller wheel sizes.
@Josh-1793 жыл бұрын
20's on something like an Escalade look tiny.
@spacep0d3 жыл бұрын
This makes me glad I went for the Tesla Model 3 Stealth P3D-!
@ecospider53 жыл бұрын
That is a great reason not to make Escalades.
@ameraldas36413 жыл бұрын
you can fit bigger brakes. thats about it.
@blackdatto3 жыл бұрын
I quite like the factory 20s on my r35
@Dexter_Solid3 жыл бұрын
Sweet, so my 37" tires on 17" wheels for my truck is really saving the planet. Nice
@iNick903 жыл бұрын
Assuming those tires are still within the profile of the vehicle. 👍
@FOXCRF450RIDER3 жыл бұрын
And it looks right
@TheTyisawesome3 жыл бұрын
Lmao sounds like Alberta
@EngineeringExplained3 жыл бұрын
Thanks for doing your part! 😂
@low-daddy3 жыл бұрын
@@iNick90 ...and weigh as much as the stock tire wheel combo.
@mosca32893 жыл бұрын
For all cars, you just notice it more on electric.
@jonathanarmer24453 жыл бұрын
Recently switched from 18 to 19" wheels on my Model 3 and I thought I was going crazy or my battery was just degrading after my range went almost exactly from 299 to 284 and I noticed higher wh/mi when driving so this video provides great clarity and closure haha.
@gregthesplintercell2 жыл бұрын
Did you change back to 18" wheels? I'm thinking of going from 19" to 18"
@DataCab1e3 жыл бұрын
7:50 Changing tires at 75mph. You, sir, have one hell of a talented pit crew.
@phasmata38133 жыл бұрын
Remember when cars had 14" and 15" wheels? Pepperidge Farms remembers.
@Kalvinjj3 жыл бұрын
I remember. I just need to look at my garage, family commuter life
@stephensmith20273 жыл бұрын
I drive a Hyundai Getz, 14" rim club represent!
@jnawk833 жыл бұрын
My truck has 15" wheels and 32" tyres
@christojoseph24763 жыл бұрын
My swift has 14inch steelies 😂
@miketeeveedub57793 жыл бұрын
I've got a '84 V Jetta Gli coupe with the 14" Snowflake wheels on 175/R14 60 tires, and the ride is rough as it is. I don't want to imagine how rough it would be with 16" or 17" rims with low profiles! Low profiles are the high-heels of the automotive world: looks great, but impractical.
@mihaimera78373 жыл бұрын
So... why does this happen? Why are smaller wheels more efficient? That's what I actually expected you to talk about. The rest of the physics is quite intuitive
@schmke3 жыл бұрын
Agree. You used Tesla's provided coast down curves, but would love an explanation and the math behind why the curves are different. Is the tire diameter actually slightly different and that is the reason? Or is the weight of the tire/wheel combo different and that accounts for the difference?
@pranavpieces3 жыл бұрын
@@schmke I think its because larger diameter wheels usually have greater width? I don't know. Yeah, Jason should have explained this!
@dudeical4schanel3 жыл бұрын
More of the mass of the wheel + tire is near the outer edge of the wheel. This requires more torque to turn the wheel with more mass further from the center of the wheel. Less efficient
@bshwayde3 жыл бұрын
It’s because smaller wheels have less mass and thus less inertia
@iNick903 жыл бұрын
Smaller wheels have less mass, less mass takes less energy to move
@luke9822 Жыл бұрын
It would be wonderful if someone did an analysis on various OEM and aftermarket wheels and tires to show how they rank for range efficiency. That way, people could compare them and make informed decisions. Using that along with average tread miles on the tire would be wonderful. This is the kind of stuff I wish Consumer Reports would focus their money on.
@jcjcjcjcjcjcful3 жыл бұрын
still doesnt really explain why larger diameter wheel leads to lower efficiency
@wnbdriver3 жыл бұрын
they just need to reverse the options pricing. "Oh you want the 18 inch wheels? That will be an extra 1000$" "But it comes stock with 20s" "I know. But the 18s will increase your range by 15%". Of course that argument has no chance against "I'll take the most expensive option please. Spare me the details"
@kjyu3 жыл бұрын
@Peter Evans You are talking about larger diameter tires and what you say is true, but I think the video was about the same overall tire diameter but smaller rims.
@Avetho3 жыл бұрын
Well, Forza models this well since increasing rim size lowers the car's stats slightly
@Al.j.Vasquez3 жыл бұрын
Not trying to kill the joke but, that's because of rim size, the bigger the rim, the heavier.
@lastminutesolutions3 жыл бұрын
but in forza world, burn outs happen with rev hangs 🤣🤣
@Thatdavemarsh3 жыл бұрын
As an ME, I absolutely LOVE your whiteboard work. Such a great channel. Cheers!
@FutureSystem7383 жыл бұрын
Sums it up perfectly. “Bring back big sidewalls and get rid of silly low profile tyres!” Win, win, win win! I do not understand the absolute obsession that many people have with ultra low profile tyres.
@crhu3193 жыл бұрын
They waste less rubber
@LazerLord103 жыл бұрын
6 inches of groudn clearance? *laughs in honda Fit
@ac-130fan3 жыл бұрын
groudn
@bengreene90723 жыл бұрын
Right. I'm constantly scraping mine on my driveway
@riccardovezzosi3 жыл бұрын
110 mm is about as low as it gets on any car with stock suspension that's on the road, and that would be a first gen bmw z4, but a Honda fit at 130mm is still far lower than a porsche 911.
@jaket60073 жыл бұрын
My yaris is basically slammed from old suspension when there are more than 2 people in the car. Scrape city is not a fun place to be
@manofsan3 жыл бұрын
After driving a Hyundai Accent, it makes me want my next purchase to be a jeep
@TheJube973 жыл бұрын
Oh yeah!!! I love this video, Never got to liking Low-profile wheels. Yes they react faster but then again, more expensive, louder, stiffer and doesn't protect rim.
@---cr8nw3 жыл бұрын
And you can't run white walls.
@NandR3 жыл бұрын
Yeah that’s why I loved the 18” wheels in my 2008 Bullitt Mustang. Nice fat sidewall. Looked nice, rode nice and protected the wheel better.
@GarageSupra3 жыл бұрын
There is more to it than that, a wider tire on the front will give you worse turn in. There is a fine balance and a few other things he doesn't cover in this video that are a major part of efficiency and performance.
@glne29 ай бұрын
Your theoretical presentation is very impressive. Last year I went from a 19 to 20" wheel on my Model 3 Performance. My daily commute is approximately 100 miles round trip. For the time being I get to enjoy carpool lane access in my state driving solo, so I'm able to cruise at about 75 mph. I've noticed only a 3% real world increase in battery usage.
@alexeysamokhin96295 ай бұрын
What’s the point to increase tires then?
@svillenatanassov3 жыл бұрын
"You can ask them: Why do you hate the environment?" :D
@Desertfox923083 жыл бұрын
BMW I3 owners have just entered the conversation...did someone say pizza cutters? Lol
@craigb31543 жыл бұрын
Alot of them were changing their 20s that come on the higher end model to the 19s because the ride was so harsh.
@abzdeman923 жыл бұрын
11:07 hahah bigger wheels on a tesla, make sure to ask why do you hate the environment lol
@Desertfox923083 жыл бұрын
Tire shaming! Lol
@SkaBob Жыл бұрын
I read a guy put 15 inch show tires on his Bolt and gained about 20 miles of range. The snow tires were not even low rolling resistance, where the original tires were. I think they come with 17's.
@copperkeyracing61673 жыл бұрын
People ask me about this EXACT thing all the time. Why do cars have big wheels now adays and what are the benefits? I tell them, each time, handling and steering response, everything else is a loss. Loss of HP, loss of gas mileage, worse comfortable ride, loss of money for higher cost of tires and the damage is more likely/often from potholes and curbs, more expensive wheels to replace, efficiency, etc etc. Of course, most people think larger wheels look better also... but that's just a trend that manufacturers have gotten into, which they could all back down on. As I tell them, it all comes down to balance. How much better handling and steering response do you want while sacrificing everything else. Each time, they state they'd prefer smaller wheels, as they don't even push their cars that hard. Now if all manufacturers could back down on the size, we'd be a happy planet. I don't prefer large wheels, stock size is good, smaller is even better. The limit being the size of the brakes and what can you fit over them. Usually, u can go down 1" or 2", sometimes 3", depending on the car. About 20years ago, cars had smaller than optimal, now we are waay larger than optimal, in my opinion. About 10-15years ago, wheels were the correct size, no need to go up or down. So go buy a used 10-15year old reliable car (Toyota, Mazda, Honda, Subaru), and call it a day. That's what I call efficient, and no electric car costing 4-10 times more can compete. Better yet, get an 10-15year old Hybrid/electric... but I can't stand those things, too slow, too boring.
@basithph89583 жыл бұрын
On the upside, you don't have to worry about your wheels getting damaged by potholes since they're smaller sizes
@jeeewhyyypheee3 жыл бұрын
"your"
@jwalster94123 жыл бұрын
you are wheels
@dorvinion3 жыл бұрын
I wouldn't be so sure of that I ruined a 16inch alloy rim and its tire on a pothole and was only doing about 25 or 30. Wasn't even a monster hole
@clayz13 жыл бұрын
Is that because smaller wheels don’t go as far into the pothole as big wheels?
@Margarinetaylorgrease3 жыл бұрын
I have the best Tires. My wheels go around, like no other ones do. Many people say this about them. Great tires.
@tyrantwitness24829 ай бұрын
What should decide wheel size? Brakes! The brakes need to be large enough for the performance of the vehicle and that alone should decide the wheel diameter.
@StarCravingPictures3 жыл бұрын
Given the popularity of SUVs/Crossovers, especially those with larger wheel base intended for off-roading, I'd be curious to see your analysis of off-road tire efficiency.
@LaurentVitalis3 жыл бұрын
I would like to know the impact narrower tires have on braking distance.
@JohnResciniti3 жыл бұрын
All aspects of performance. Braking, acceleration, handling. How big a tradeoff are we willing to make for range vs performance?
@yummyhershey59023 жыл бұрын
And also the performance changes that would come with larger sidewalls
@jonboy6023 жыл бұрын
It has very little effect. Grip isn't changed much, as for any given tire pressure the contact area is the same regardless of tire width.
@JohnResciniti3 жыл бұрын
@@jonboy602 how can contact area be the same regardless of width? The wider the tire, the more contact area, no? I get that aspect ratio beyond a certain point isn't going to take away from performance. What is the best for each of these cars for performance, safety, and economy? It depends.
@TWX11383 жыл бұрын
@@jonboy602 that is very much not true. Contact patch is roughly circular, small changes in the radius of the contact patch result in large changes in area. From my own anecdotal experiences, I replaced 205/75/15 tires with 255/60/15 tires on a RWD car. With the 205s I was very easily able to break the back tires loose and do a burnout on dry, clean pavement. With the 255/60/15 tires it was not easy to break the back tires loose, I simply had grip. Admittedly these were not the same brand of tires, but they were targeted towards the same mid-priced market.
@BeefGold3 жыл бұрын
I would like to know what effects driver weight might have on range. To keep math simple while using weights within the reasonably expected range at your local Walmart, you could use a 160lb individual versus a 320 lb individual.
@Blox1173 жыл бұрын
most people who shop at walmart aren't going to be driving a tesla lol
@---cr8nw3 жыл бұрын
@@Blox117, that's like saying most people who shop at Best Buy aren't going to have three nipples. Most people aren't going to be driving a tesla, regardless of where they shop.
@lordflufffluff3 жыл бұрын
@@Blox117 Where else would you go?
@Blox1173 жыл бұрын
@@---cr8nw well it was mostly a joke about economic status and wealth, not statistics
@---cr8nw3 жыл бұрын
@@Blox117, well.... joking about people's economic status and wealth.... classy.... You seem like a person I wouldn't want to know.
@alexgarcia39003 жыл бұрын
You should make a video about what tire pressure to use. Lots of people believe that you gotta run the max psi the tire says for some reason. And mechanic shops do the same when installing tires. When I bought my truck new they set it to 40 psi . And it was supposed to be at 29.
@Jarl_693 жыл бұрын
So fat tires and small wheels? Sounds like a perfect drag setup to me...
@omelborpon31594 ай бұрын
You know it.
@boboutelama57483 жыл бұрын
In Swizterland, we have a lot of those BMW i3 cars. I meet some everytime I go out. I'm always impressed how narrow their tires are when you compair it to 90% of the rest of the market. This is at least one thing that BMW made right on this car.
@pepstein3 жыл бұрын
Base i3 wheels are 155/70R19. Definitely narrow, but also much larger outer diameter than usual. Really unusual setup.
@putrid_swamp_juice3 жыл бұрын
They look really cool if you ask me. Reminds me of old Beetle-wheels :)
@superchargedpetrolhead3 жыл бұрын
bmw could have given a smaller wheels with wider tyres and still got the same aerodynamics benefits..
@boboutelama57483 жыл бұрын
@@superchargedpetrolhead I don't believe it no. The wideness of the tire is the thing the wind sees when it hits frontal under the car. It can be channeled to some extent. But there is always some air that will frontal attack the wheel base. You can look at eco-protoype racing. The tires are nearly roadbike like.
@benjaminmellingen53403 жыл бұрын
Thank you for the great explanation :D Hope you are doing well in these weird times ;) Greetings from Norway
@grateful78393 жыл бұрын
Yay for Norway. Big time EV leader.
@A-Q-R-S19 күн бұрын
Nice content! For bigger wheels + smaller tires, air resistance is an absolute god. Also, for low-profile tires on big rims, the tire has shorter and stiffer sidewalls. That has an impact during cornering and also changes the overall tire grip on the ground and rolling resistance. Howeever... For all of you going crazy over "I put bigger wheels+tires (both) & the computer says fuel economy is worse"... - 1st, your on-board computer is calibrated for specific stock size calculations. With bigger wheels+tires (both together) a 100-mile run looks like e.g. 95 miles for the computer. Its calculations are off. Recalibrate or calculate manually. - 2nd, always compare same-width, thread and type of tires. - 3rd, always compare with the same overall weight, fuel level, road strip & elevation, time, traffic, AC, weather, wind, outside temp, engine temp, etc. Best scenario: same type tires, tire pressure, compensate wheel weight difference, full tank, same gas station, same pump, circular or 2-way trip, at night, no traffic, no AC, dry road, no wind, warmed-up engine before fuel-up. - 4th, speed matters. Urban or motorway matters. Bigger overall size wheels+tires are better for higher speeds (easier to reach higher speed, less engine load). On the motorway, that's almost like a 6th gear in a 5-gear car. In urban areas, bigger wheels+tires hate lower speed (more engine load and fuel consumption). I haven't seen a single fully correct comparison online.
@douglasheld10 ай бұрын
What I was hoping to learn from you was the difference in 1) mass of a large wheel with low profile tire vs. small wheel with high profile tire; and 2) the angular momentum difference in the two.
@rp96749 ай бұрын
Total mass , wheel + tire
@douglasheld9 ай бұрын
@@rp9674 That didn't explain anything.
@Lianpe983 жыл бұрын
*BRING BACK 14" WHEELS...* and white walls too, why not?
@veritasiumaequitasius35303 жыл бұрын
My 1st gen insight has 13 or 14" wheels. I got "only" 65 mpg the other day without really using the hybrid drive.. because I had low tire pressure.
@kronos69483 жыл бұрын
White/yellow lettering is making a comeback already. I want to see more of it!!
@NitrousFox3 жыл бұрын
Cadillac had something interesting going with the last gen CTS. You could get rims down to 17” but they scaled the sidewall down a touch and didn’t make the fender wells huge so it looks damn clean.
@joshuagibson25203 жыл бұрын
15s and some sidewall are perfect
@travisb91303 жыл бұрын
I had a car with 12-in rims. Talk about hard to find tires for it.
@Paul-pj5qu3 жыл бұрын
This is an extra reason. I want to get away from low profile because I drive on typical city roads a lot!
@nihongobenkyoshimasu31903 жыл бұрын
1:39 There is a missing component : (4) the effect of a wheel cover on the Tesla Model 3 with 18" compared to the 18" / 19"/ 20" with no cover
@amdsemporn60183 жыл бұрын
In general, you are correct with your results in the sense that for a given wheel dimension, a smaller rim is more efficient. However, small tires in general are very inefficient. Because of this we see wheel sizes increasing. The tire with a small outer diameter has to spin faster for a given speed, because the radius is smaller, it gets more deformed --> less efficient. So a very large tire diameter is a thing increasing the efficiency! Just look at a BMW i3, a car that has been optimised for efficiency. There, the tire diameter is very large, the car has 21" rims as standard. Another benefit of that is, that you can make the tire even slimmer, reducing the area of the tire exposed to air resistance further. So look out for an electric car that can fit a very large outer diameter wheel if you’re searching for maximum efficiency. By the way: Those great looking rims with slim spokes are very inefficient, too. The standard M3 rims are very closed, creating less drag. They don’t look that cool, though...
@alexjenner11082 жыл бұрын
checking BMW i3 base model specs from my local BMW web site: Tire = 155/70 R19 84Q, Rim = 5Jx19 LM so maybe those 21 inch rims you mention are some sort of option.
@fleghel3 жыл бұрын
We use to think: I would pay more and get bigger tires because they look cooler, now we think: I’m gonna get the bigger tires “to show people that I don’t have range engziety” lol
@kamikazi25003 жыл бұрын
Anxiety*
@fleghel3 жыл бұрын
@@kamikazi2500 yep- that. Lol
@defnub3 жыл бұрын
If you lowered the tesla with 18in rims would you gain mileage?
@jeeewhyyypheee3 жыл бұрын
Did you even watch the whole video mate?
@low-daddy3 жыл бұрын
The answer you were looking for is - yes.
@thapelomashaomasemola79223 жыл бұрын
Best to go donk with your tesla, go big or go home
@defnub3 жыл бұрын
@@jeeewhyyypheee yes but he didn't go into lowering the vehicle, he stated the ride height was 6in off the ground
@krusher743 жыл бұрын
@@defnub he talked about aerodynamic front area of the tyres, lowering would reduce this but gains will be very small. less air underneath is also less drag.
@Lpotter86 Жыл бұрын
I was the Guy at the Clarkston Service Center that was working on getting your wheels and tires ordered. I had quit before all the parts arrived, sorry. (4 1/2 years as Service in Michigan took its toll)
@OlavAlexanderMjelde3 жыл бұрын
On my 3P I have gotten custom made 19x9.5 wheels weighining about 4kg less than OEM 20" per corner. Then it rolls on same type of tires,so much less rotational mass, much less unsprung mass. Better accelleration, better braking, better handling (less work for suspension). Then also the car is dropped quite a lot on KW V3 coilovers.
@JimA86s3 жыл бұрын
What about the unsprung weight added from bigger wheels, how does it affect performance and range ?
@suserman77752 жыл бұрын
It doesn't. It affects ride comfort and grip over bumps, but not range.
@ericchandler90 Жыл бұрын
It will affect range in stop and go traffic. It takes more energy to accelerate with more weight.
@sachinadams Жыл бұрын
Interesting to know that weight won’t impact the range? Can you explain
@Roddy4513 жыл бұрын
Bigger (& wider) wheels will very likely increase the stress on the suspension components and the wheel bearings. I kept the same size on my car but searched for lighter wheels to reduce the unsprung weight. Excellent video!!!!
@awebuser59148 ай бұрын
Typically, the wheels are not wider and the tire width is the same. As long as the offset is is the same, even a wider wheel would have no impact on suspension "stress". It's strictly a "+1" or "+2" aspect ratio change for looks alone, nothing else.
@mr88cet23 күн бұрын
Bingo! I’m pretty mystified why (apparently) people supposedly like huge wheels with rubber-band-thin tires! They kill your range/efficiency, they give a bumpier ride, they are more easily damaged by potholes, they’re noisier, and I personally don’t even see why people apparently think it _looks_ better!
@leftcoaster673 жыл бұрын
Tell me you're going to teach engineering? You're an outstanding teacher.
@erroo51013 жыл бұрын
Nice vid as always buuuut: I'd like to know the reason why there is a difference between different diameters. i.e. the reason of the graph at 7:44. I saw your clarification but i can't understand. If it is only a matter of aero, why the gap in efficency gets smaller increasing the speed? (9:20) I mean, and please correct me if i am wrong, the higher the speeds (linear or angular) the more relevant the aero. What am i missing? And, why data from Model 3 are so different from X and S? X and S numbers are not weird to me but damn, i can't conciliate with thoose of the Model 3 xD
@briangarfield97533 жыл бұрын
It's not the actual diameter of the wheel, it's many factors associated with that diameter. A performance tire has more grip, therefore more rolling resistance. The SAME wheel in a larger diameter weighs more and is more rotational mass. If the larger wheel comes with a wider tire, more rolling resistance again. In other words, the combination of the wheel and tire are the true factor, not just the diameter of the wheel. I can assure you that you can find some taller wheel combinations that will yield better fuel mileage if the wheel is lighter in weight, skinnier, and you mounted a Low Rolling Resistance style tire on it. However, in *general*, the larger the wheel diameter, the more likely to have a performance tire (sticky) and the more weight and more rolling resistance.
@USGrant21st3 жыл бұрын
It must be predominantly the total weight. If you look at the tables, the biggest effect is on the smallest (lightest) car at the slowest speeds.
@RobertLeBlancPhoto Жыл бұрын
What about if you keep the same wheel size, but switch to a tire with slightly taller sidewalls, such as going from 225/40R19 to 225/45R19 with the exact same wheels? Would this approximately 4% increase in circumference also equate to better efficiency, or will the added weight of each tire negate it or even decrease efficiency?
@scottbreseke7168 ай бұрын
Your tires may rub against the wheel wells during sharp turns.
@CoyCrawfordII3 жыл бұрын
That's crazy the diameter of the wheel and not tire makes that much difference! You're the man Jason! Keep doing you!
@SupraSav8 ай бұрын
I noticed this dramatically on my E92 335i. It came with 19" wheels with the sport package. I put 18" forged wheels on. It was noticeably quicker off the line, turn in was quicker and bumps were less jarring. Not to mention replacements are cheaper on smaller diameter wheels and tires.
@BirdiesGoCherp3 жыл бұрын
I can't hear you over how cool my 25" wheels look.
@Turk3803 жыл бұрын
do they, though?
@3bdo_3 жыл бұрын
@@Turk380 he prolly has one of those jeeps that is garage queened
@TristanJCumpole3 жыл бұрын
@@Turk380 He can't hear you over how cool he *thinks* his 25" wheels look.
@BirdiesGoCherp3 жыл бұрын
@@TristanJCumpole this guy gets it
@TristanJCumpole3 жыл бұрын
@@BirdiesGoCherp Obviously I am the only one....
@BakouMOH3 жыл бұрын
It would be interesting to see the difference in range between an aerodynamic wheel that is heavy (most likely cast) and a lighter wheel (flow-formed or forged) that is not aerodynamic in the same size and a + size. For example, a 16'' e-Golf wheel (aerodynamic, but very heavy) and let's say an Enkei RPF1 (not aerodynamic, but light).
@awebuser59148 ай бұрын
Wheel weight is irrelevant in steady-state driving, it would have zero impact on range (OK, maybe a minuscule amount due to the curb weight being a tiny fraction higher...)
@euanmacrobbie8714 Жыл бұрын
I've been watching your videos for years. I love the fact that you save me having to do the calculations etc on my own, as this is not easily available information. And based on this video I have decided not to put the larger wheels I had before buying my mg 4 on the car.
@deFruitberg3 жыл бұрын
Gordon Murray is 100% agreeing. He puts 19" wheels on the new T.50, and calls large wheels "nonsense" and "rubbish", "they are just styling and do nothing for you, they count against you on unsprung weight and ride quality", according to him.
@businessexplained95783 жыл бұрын
Soooooo... Bigger isn’t always better?! You should tell that to my uncle! All jokes, your friends at Business Explained!!
@Iunio923 жыл бұрын
Is this a joke about how your uncle is packing schmeat?
@fafhrd00233 жыл бұрын
Really interesting data charts. The impact vs speed relationship seems to vary depending on car, with the model 3 having a much bigger (30%) difference at low speeds while the others having less difference at low speed. Seems to imply that something other than aero is strongly impacting the model 3 numbers.
@lewisrainwater95272 жыл бұрын
electric motor impedance
@alexi0773 жыл бұрын
Last week I swaped the summer for the winter wheels. 19×10 285 45 R19 summer to 235 65 R17 winter. The consumption dropped down about a liter on 100km. Range went from 950km to 1150km. For people who like units in a stone×leg per evening style, that's a difference of 4 miles per gallon and about 120 miles more range! On a X5 Diesel.
@charliewilson90623 жыл бұрын
As someone who works in the field, i would caution against a few conclusions. The 'C' term in the road load curve is not just aerodynamics, tire RR has some 2nd order effects. So you cant just compare aerodynamics in a vacuum when going from one wheel size to the next. Additionally, one somewhat decent metric for comparing wheel aerodynamic performance is the opening area. You could make a 20" wheel with a cover and it would be comparable to a 17", but generally thats a no-go from the styling department. That's why, in general it's harder to control aerodynamics on a larger wheel diameter but it certainly can be done and you'll find wheels that are good and bad regardless of size.
@FutureSystem7383 жыл бұрын
Sorry Charlie, Not entirely true- because you can’t control the aerodynamics of the BACK of the wheel- it DOES make a difference even though less than the front.
@charliewilson90623 жыл бұрын
@@FutureSystem738 we are talking diameter here, not width. Width has a direct impact on frontal area and would be reducing your Cd if you could maintain the same drag hange point to change point.
@FutureSystem7383 жыл бұрын
@@charliewilson9062 I’m very well aware you’re talking about diameter. I should have used the words “inside” and “outside” of the wheel rather than front and back. There is still aero drag on the inside of the wheel, even though it’s significantly less than the outside where an aero cover can be installed. (It’s one reason some manufacturers like Tesla try to make the floor pan as flat as possible. There is still air moving under the car, and aero drag, and the inside of the wheels is all part of it.)
@chrisdonaldson1033 жыл бұрын
Would a 17 inch wheel increase range? Great video and as always, great information.
@4R8YnTH3CH33F3 жыл бұрын
They would presumably, yes, as compared to a larger size. I don't think you can run anything smaller than the 18" wheels on the Tesla though due to the giant brakes. Anything smaller would not have clearance. Theoretically you could fit smaller brakes but that would be seriously compromising driver safety trying to chase energy efficiency which is not advisable.
3 жыл бұрын
I'm guessing 17 inch wheel wouldn't be possible to put on Tesla Model 3 Performance because of the brake disc size.
@Blox1173 жыл бұрын
0 inch wheel = maximum efficiency
@boxr_42143 жыл бұрын
@@Blox117 limf(x) as x->0^+ = infinity.
@davidg57043 жыл бұрын
@@4R8YnTH3CH33F Custom rotors built on the axle instead of each wheel would solve that issue. Upgrade by using greater # of pistons in calipers.
@Turk3803 жыл бұрын
this is why I buy all my tires from Coker. bring back the bias-ply pizza cutters!
@jupiterjunk3 жыл бұрын
. You just brought back memories of my 1962 Ford Falcon Futura. Thank you for that.
@aptkeyboard31733 жыл бұрын
Honestly, most public roads are not maintained well enough for 20+ inch wheels to be a good choice. It makes the ride quality worse and much more likely to get a flat tire or bent rim. Performance and aesthetic gains from large diameter wheels is not worth the other drawbacks.
@babybirdhome3 жыл бұрын
I used to deliver tires and wheels for a wholesaler/distribution company, and there’s another reason for loss of efficiency with larger wheels. In general, they weigh a hell of a lot more and thus have a lot higher rotating mass which is terrible for overcoming inertia, both for accelerating and for braking. You have to pay a lot for a lighter weight, larger diameter wheel, and if you paid the same “lot more” for a smaller diameter wheel, you’d still get better efficiency and performance.
@peanutsarehairy3 жыл бұрын
Interesting video and nicely explained. One thing that would be interesting though is the difference of weights for larger wheels vs size. For example would a 19" wheel that's 1kg lighter than an 18" have much affect on range? I know it's more acceleration but over the time of a full battery surely it's of some significance that could maybe allow going bigger and have less of an impact in range?
@awebuser59148 ай бұрын
It's all about aerodynamics, it has almost nothing to do with weight. A slightly lighter/heavier wheel would change the inertia to overcome while accelerating, but do nothing steady-state.
@riceChrispies222 жыл бұрын
Tesla's range graph is based on their OEM 18"-21" wheels which also have increasing weights as diameter increases. So the drop in range can be due to increased unsprung weight and not necessarily increases diameter. So if that is the case one can install larger aftermarket wheels (forged or flow formed) that are lighter than the smaller OEM wheel, and possibly achieve the same if not better range.
@HomeCinemaJunkie11 ай бұрын
+1
@awebuser59148 ай бұрын
Wheel weight is irrelevant in steady-state driving, it would have zero impact on range (OK, maybe a minuscule amount due to the curb weight being a tiny fraction higher...) As Jason said in the comments, it's 100% aerodynamics (poorer) of larger wheels of a similar design.
@lorre0073 жыл бұрын
One thing that strikes me: 9:19 you see the data summary. There you see a massive range impact difference for the model 3 at lower speed (i.e. 30,2% range impact difference when driving 5mph). That makes no sense. The data for Model S & X don't show that difference => Why?
@alanjm12344 ай бұрын
What's crazy to me, is that as you go up through a model range into a more luxury specification, you get bigger wheels with lower profile tyres. Which makes the car LESS comfortable, noisier and more prone to punctures and rim damage.
@stephensmith20273 жыл бұрын
James Dyson: *laughs in 24 inch wheels* Maybe that's why his EV project failed!
@Smirnoff673 жыл бұрын
James Dyson and his product are just renamed actual technology that are somewhat overpriced to make it look cool. Like Apple. And even Apple make some sort of effort to create some new use of tech' actually. This guy barely create anything worthy in the end. Him making a car would have been a real joke, and a scam
@Darkest_matter3 жыл бұрын
@@Smirnoff67 Dyson vaccums put out a lot of power though
@Smirnoff673 жыл бұрын
@@Darkest_matter Not more than any other electric motors existing since years.
@DrMatthewhannah3 жыл бұрын
At what point does going smaller no longer improve range?
@yehudagoldberg64003 жыл бұрын
Practically, when the wheels no longer fit over the brakes and rotors.
@paulogden74173 жыл бұрын
When the friction of the car sliding on the ground equals the reduction in rolling resistance.
@TheKingpleb6 ай бұрын
One thing I didn’t see mentioned was the weight of the wheels as well contributing to the overall return as well.
@knroo-j14873 жыл бұрын
This video couldn't have come at a better time. I was in the process of buying new wheels for my M3P. Great to see some factual information to support my decisions, thanks for the informative video!
@IngOehman3 жыл бұрын
That was a VERY weird and unusual episode... 🤔 When looking at engineering explained, you typically can sit down and relax, being pretty sure that the perspective is going to be scientific. But here you are analysing the impacts of physical things, but when it comes to wheel diameter, you just basically say “Tesla says”! 😳 I’m not saying that Tesla is wrong, and I don’t hate high sidewalls, on the contrary - I love high sidewalls! (Yes, I am that old.) I like the tire to be/remain the mechanical vibration isolation that the tires were invented to be! And I like formula one cars to use wheels with high sidewall-tires! So I’m really sad about the new F1-regulation change, applauded of coarse by the tire manufacturers that have been pushing the meme “big wheels/low tires is better/cooler/sportier” for so many years. 😕 But - you just can not just buy the numbers regarding range, directly from Tesla! Other people play it like that, but not you! That is not scientific! The range depends on so many things! Tire pressure for one. It just is so unscientific to talk about diameter of the rim so people with less knowledge mistakes it as something that’s proportional to the circumference of the wheel with a tire on. So please be your normal self and go into the physics! Don’t just quote claims from Tesla! If Tesla’s right regarding the range being almost inversely proportional to the rim diameter (even when to tires outer diameter is unchanged) then go into the WHY. Tell us about sidewall losses that becomes higher when the sidewall is exposed to a higher degree of relative deformation. Or just ignore me. 😀 I am sometimes unnecessarily negative. ☺️
@Kepe3 жыл бұрын
I'm pretty sure he used that data because a) it's available online b) it's very likely measured data c) it's pretty much impossible to calculate that stuff by yourself. You'd need to run very advanced CFD simulations on a very accurately 3D modeled car to get the drag data. Then you'd need to do some sort of physics simulations on how different tire sidewall heights affect range. It would probably take weeks of full-time work and very expensive software and hardware to be able to calculate this stuff. So why not use data that is already out there? I don't know about the USA, but at least in my country, false advertising is illegal. So if Tesla is advertising those range numbers on different wheel sizes, I'm pretty sure they aren't lying. And the most important piece of data there isn't the range itself, but the difference in range between different wheel sizes.
@srinitaaigaura3 жыл бұрын
How does the mass of the wheel and moment of inertia contribute to amount of range loss vs merely a size increase? Could it be more due to this?
@mitchellsteindler3 жыл бұрын
Very unlikely. The energy to accelerate the wheel is far less than energy to accelerate the whole car. It's negligible. Also, are bigger wheel systems actually heavier than smaller wheel systems?
@jeeewhyyypheee3 жыл бұрын
@@mitchellsteindler Simple math for me, smaller diameter take less energy to rotate. Thus can make greater total distance required. But downside for slower top speed compared to bigger diameter
@WetPig3 жыл бұрын
@@mitchellsteindler It depends on the tire. Aluminium rims with thin profile tires might not weigh a lot, but put a smaller size rim and a very thick tire... it will definitely up the weight.
@prjndigo3 жыл бұрын
The torque ratio has more effect.
@Rahul-Nalawade3 жыл бұрын
Inertia is M*R^2. Here, mass difference would not make much difference as compared to the diameter.
@DrakeRichter2 ай бұрын
It's pretty wild that the Blazer RS with 21" rims and a ton of ground clearance still gets up to around 335 miles
@zachyoung55983 жыл бұрын
So you're saying the 35 inch tyres on 15 inch rims on my diesel truck are saving the planet. Phew! I was worried for a minute. Thanks, Jason.
@omelborpon31594 ай бұрын
Your setup is much better than 35 inch tires on 32 inch rims.
@integra85023 жыл бұрын
I thought it was more about the "Weight" and the (Rotational Mass)
@ryang37513 жыл бұрын
Exactly, he didn’t mention the weight at all.
@Kepe3 жыл бұрын
Weight of the wheel only affects energy required to accelerate the car. When driving at a constant speed, wheel weight doesn't matter.
@Kepe3 жыл бұрын
@Art Uro That's because a fat, low-pressure tire has a lot of rolling resistance while a narrow high-pressure tire has very little rolling resistance. It doesn't have anything to do with mass. The mass of a wheel only affects the energy required when accelerating. And electric cars have regenerative braking, so even if the tire has more mass, then you get more energy back when decelerating.
@Andrew-jm6el3 жыл бұрын
Unsprung weight should make a difference and none of it is covered here.
@NightHawkVII3 жыл бұрын
The title should be: "Why Big Wheels Are A Bad Idea". It doesn't matter if the car is electric, ICE, or coal powered. XD
@user-ck1zs5zk5b8 ай бұрын
Wow! Thanks, for the enlightenment. Also, I see a far larger improvement at lower speeds for the model 3 --> 19.4% at 50mph and 21.96% at 40mph.
@marcov.79383 жыл бұрын
The dissertation on the separate effects that go into the resistance is correct, but there is no real mention of WHY a taller sidewall should be more efficient. As a matter of fact, ceteris paribus, a taller sidewall is LESS efficient. More rubber that goes through an hysteris cycle. Proof of this is that taller sidewalls are more comfortable: that's because they deform more under load and we all know DEFORMATION OF HYSTERETIC MATERIAL = ENERGY DISSIPATION. Also: a lower aspect ratio tyre weighs LESS than a higher aspect ratio, if the width is kept constant. The additional weight of the rim does not offset this difference, usually. The overall diameter stays constant, as you showed, so there is no big difference in rotational inertia, too. What you mixed here are different things: - lower sidewalls imply larger rims/spokes ---> worse aerodynamics - larger diameter wheel options usually come with LARGER tyres (width) --> worse aerodynamics, worse rolling resistance So at the end of the day it's not really the sidewall itself making all this difference, but other aspects that are usually (but not necessarily) linked with it. Of course it would be a different story if the OVERALL diameter of the wheels would change.
@johnj86393 жыл бұрын
Wouldn’t the larger sidewall of the higher profile tire increase rolling resistance because it allows the tire to flex more?
@srinitaaigaura3 жыл бұрын
More than made up by the weight saving from the smaller wheels. Jason's last video on wheel sizes showed shocking differences in weight.
@johnj86393 жыл бұрын
@@srinitaaigaura depends on the wheel and the material its made out of, if you're going for performance, those wheels will be significantly lighter.
@nihongobenkyoshimasu31903 жыл бұрын
When coparing the 18", 19", and 20" on a VW ID.3, Bjørn Nyland didn't really notice too much difference, may be like 3% total?
@SpaghettiKillah3 жыл бұрын
For a 500 km range that's 15 km difference. That's quite a lot actually. On its own it might not look that much...but % tend to aggregate. Say you have a big tire...and you're using the AC also 'cause it's hot...maybe a bit of traffic also (happens often in California) All of the sudden you're losing about 15% efficiency (3% from the bigger wheels, 5% from the AC...7% because of traffic)...now you just lost *75 km* of range !! Those 15 kms from the wheel would come in handy....
@pepstein3 жыл бұрын
I suspect VW is using similarly low rolling resistance tires and aerodynamic wheels for all three sizes, hence the smaller penalty for larger wheels. I think this is more representative of the true impact of larger wheels.
@lancelacour67173 жыл бұрын
I'm lousy with math but I can give a real world testimonial. On my 2019 Model 3 Long Range Dual Motor, with the stock wheels and tires without aero caps I got about 300 miles on a full charge. With staggered 20" wheels and tires the range dropped to about 245 miles. What's even worse is the fact that acceleration was noticeably slower. Watching the WH/mile hover around 370 at 70mph was really demoralizing. I went back to stock wheels and tires after about 1000 miles.
@joerith003 жыл бұрын
I still don't understand why the smaller wheels have an increased range, I thought the low profile tyres had less deflection, therefore less rolling resistance. Can anyone explain this to me?
@dwt513 жыл бұрын
And no mention of tire pressure?
@FaceTubeU3 жыл бұрын
His calculations account for optimal air pressure as stated from the manufacturer, but yes too much and too little has an impact.
@carllarson47903 жыл бұрын
i would assume they are using the recommended PSI
@dwt513 жыл бұрын
Guess my point is that tire pressure certainly impacts mileage and I was surprised he didn't stress that.
@FutureSystem7383 жыл бұрын
@@dwt51 Good point, because so often the average driver in a typical car (ICE or EV) has the tyres under pressure more often than not. It’s one of the best things about a good TPMS system, which nags the driver to top his tyres up. People are generally lazy when it comes to such things.
@gabormiklay92093 жыл бұрын
00:51 whiteboard! 🤣
@jozsefizsak3 жыл бұрын
I'm glad someone is finally pushing back against the completely arbitrary aesthetic preference for big wheels which, if I'm not mistaken, degrade performance in every area that would matter to a car enthusiast.
@bunkie21008 ай бұрын
Anything that works against the ridiculous trend for larger wheels is, in my opinion, a good thing.