thank you for making this comment for someone who works on motorcycles this much im very surprised he had no idea why it was doing this its about the most simple explanation ever

It was such a simple conclusion, I was almost yelling at the video saying “you have two different leverage points, one hard, one softer”.

Yep... Old Archimedes could have told him what was wrong and he'd never seen a motorcycle.

They even mentioned how the wheel base would change constantly

Completely off base comment above with 3.5k likes. Actual explanation of the problem, 33 likes. GJ people

This makes a lot of sense

I also think the space between both back wheels is negative, basically making a longer wheel

Problem is suspension when the point of weight changes

i know how to do it better, don’t😂

The 60% wheel idea ... 4 good motorcycles into one bad motorcycle. Sounds twice as good! :)

😂

A horse with an even bigger appetite and severe arthritis

Yep

It's a dealer secret, they never tell you that!!

oh yeah yeah

No, it’s because one tire is bigger than the other.

oh yeah yeah

Or just don't have suspension 🤷🏻‍♂️

Or just don't have suspension 🤷🏻‍♂️

or mount the rear tire on a slightly downward facing angle, so when the rear comes in contact with ground and the suspension compresses, the travel is compensated

The tires could be mounted side by side, this would remove any mechanical advantage because that is what I was thinking too.

or having suspencion in the middle, betwen the 2 whells

Hard to digest at first, but after you said lever effect, suddenly I can imagine that easily. Nice explanation.

Absolutely. Can't understand why these guys didn't see it. It's really obvious.. Having said that, I can't think of the cure.. you'll have to constantly change the suspension mounting point, or perhaps removing the suspension altogether. Making it a hardtail, Harley style??

Fix would be to somehow have the suspension attach between the wheels so each wheel is same distance from the pivot.

The solution would also be to replace the suspension with rigid steel beams.

69th like

exactly. one wheel has a longer "arm" or moment, allowing the bike to compress the spring more. do this on a bike with no rear suspension and you shouldnt have an issue

this is what I was thinking too, they even mentioned that it might be a problem in the video but I think they misunderstood how it would manifest when riding it

My thought as as well.

THIS !!!!

I was hoping someone would of pointed this out in the comments

Needs another set of tires to balance wieght

yeah, i was thinking, if it is suspension, then bring some arms up to the back of the seat with shocks, also, maybe cut the tires by a bit less than half, so they both are in contact at each end

@@barrontrump3943 you don't need to balance each wheel, you can under-load them, and then have each's lever arm balance....but that gets mathy.

hampter

Dude I could not legally agree more. This thing screams at the top of its lungs, BAD DECISION!!! Kids and everyone else for that matter, don't try this at home. These morons are actual pros at being morons. Let them hurt themselves. Then learn from their mistakes

Just 1 q. Why?

Biker and bread do have drilling lubricant It doesn't overheat

@@slickatoe well, you'd think that's the stupidest thing in the world but today i'll have you know i scraped the ice off my gixxer thaw 2001. it was all good till i hit second and it suzuki'd all over the street.

Don't let the EPA see this

Speed of modern . motorcycle I doubt that

Lol so far horses are faster than this one but soon maybe

I hope he sees this bro. Im rooting for your date.

and to think you only needed a quarter outside kmart until now! lol

spot on man. I was thinking you put it on a chopper since they don't have suspension usually anyways. I didn't think of the 55-60% of the tire left, but that would probably help a lot too

100% correct, torque is a matter of force multiplied by distance, the further away the centre of the wheel is from the spring (rear-rear wheel is further than rear-front wheel) it will increase the amount of torque the being applying to the shock mount, therefor compressing the spring more on the rear wheel causing that bump effect. the only way to completely eliminate this effect is by not cutting the wheels in half (no point in the video), welding/removing the shock (resulting in a bad ride) or have a hydraulic spring, changing the compression force to suit the torque each wheel is producing to the spring (extremely complicated - if its even possible) if you were to have 55-60% of the wheel, it will make the torque transition smoother (correct again) but it will still have the same peak applied torque when there is just 1 wheel on the ground, which will only be noticeable at low speeds. at higher speeds, the slight extra length in circumference will become negligible

@@DeepCarrot The 55% was just to get a smoother transition in general and not for the spring compression thing

That's exactly what I am thinking too.

Thank you, finally someone who understands physics

I was searching for this before I said it Thank You.

Same thing i was thinking, so simple

yep, agreed. weight is the same but the leverage on the pivot point moves back and forth

I concur with this assessment!

I believe your right the rear axle needs lowered a little

The trailing edge of the front drive tire is collapsing, while the rear tire comes around with no weight on it making it taller than the other tire when it contacts the ground. They need stiffer tires or possibly there has to be a time of overlap where both tires are in contact with the ground, to get rid of the weird weight transfer

😂

im a motorcycle engineer, can confirm

I agree, but then mount two more half-wheels on either side outboard of the fork

I have a masters degree in mechanical engineering and I approve of this suggestion/comment!! This is -Thēē- solution! 🎉 bravo 🎈🍾 👏🏼 😊

Like it says in ...........2nd Opinions 3:5....... "Let's Don't and say we did"

OR he could make it look like a horse

Exactly. Physics - the angle of the force keeps changing.

Came here to say this. You can even see as the forward tyre makes contact with the ground the bike lifts as it's pushing against the suspension at a steeper angle, and relaxes back down as the weight goes on the rear tyre.

I should have read further before adding my comment, as you have already covered the idea. Running the tires side by side would be the only way to possibly completely eliminate the gallop. Even adding hard tires wouldn't kill it completely in it's current state as the different lengths of the armature where the wheels are attaches would react different to the centrifugal force created by the off balanced wheels. Even side by side this could be problematic since the wheels would be attached to a perpendicular axle that would cause wag instead of a gallop. The only way to make it efficient to any usable speed (for a practical lifetime for a motorcycle) would be to add a third parallel wheel and weight the rims with enough precision to stabilize the centrifugal force between the three.

@@theukdave2433 Yes ... I believe you can fix this by making one of the rear half-wheels a larger or smaller (original) diameter than the other...as to how much and which one...???? Havn't thought enough about it yet...LOL

agreed, the production value is always improving!

and the gloves being thrown at him and just popping on

I feel like you would have a lot more credibility if you knew how to spell truss.

Weld the back suspension up is probably the simplest idea, the support truss would only strengthen the back end from falling apart during vibration it wont stop the bumping due to leverage on the suspension. They need to either weld the back suspension up, or change it to an old style dual shock where is connects to the vey back axle, going to be a bumpy ride either way.

Yeah, the bicycle was a hard tail, that's why. You got it.

That's what I was thinking when the suspension compresses it lightens the load on the farthest wheel! Putting that long arm up in the air sort of? All-in-all at least it was! LOL Kind of surprising?

i was thinking the same thing. i could not understand how they could not figure it out. it took me just couple of seconds.

O believe you are onto it but and even easier fix might be to just correct the angle of the rear wheel. They also should have cut the wheels just a little bigger then half because the low point seems to be where the wheels join in the wheels are touching because they're not solid so it might be creating a flat spot. ( ) like that.

@@bennyrest9122 yes but the leverage difference is the biggest problem

I used to engineer suspension for Ford... 1) Hard Tail. - Assuming you don't need suspension, this is the best answer. Great job, I would choose this one. 2) Move the spring. - What happens is you find that spot, then you have to manage an oscillating force on the wheel plane for the rear two tires. This would require more weight and parts to manage. Basically, making a single wheel for efficient.

@@Invincibletro do you reckon it also had to so with the face that when the wheel is full it is a circle but wheb it is cut it is no longer and circle and has a flat spot which could also help woth this. C O imaging the C was slit at the top because essentially its a circle if the middle point is removed on the jointed together side. Or do you think its specifically only suspension. I thought it was only suspension at first but I looked closely at wheb it Bobbed and it was wheb the wheels where like this ( ) as upset to while either of the wheels was on the ground.

@@bennyrest9122 When the wheels are like this ( ) this is the exact moment the length of the lever changes, When they are ( ) the lever is the distance between the closest axel and the pivot. What you might be seeing is the A arm angle does change immediately when this transfer happens, lowering the closest axel, or raising it instantly between the transfer between the two levers.

needs to be placed between both rear wheels otherwise the center of mass will still primarily be on the front of the rear wheels, causing the middle wheel to compress and leading to the same leveraging issue, albeit to a slightly lesser extent. You got the closest out of anyone in the comments i've seen so far though so gw. You actually could make an independent rear suspension version but it would require redistributing the weight and altering the frame and completely changing the suspension geometry etc.

Exactly this, and I'm thinking at higher speeds the centurial forces are going to put different leverage on the swing arm, that problem would also be fixed by strutting the back wheel

@@hell_pike9150 at higher speeds the rubber is expanding and flying off.

No no no the ONLY problem is they forgot to balance the tires after mounting.....duhh

The reason it was bouncing was because they did not correctly extend the swing arm, the new length they added was on an entirely different axis than the bikes stock swing arm. Having a strut like what you're talking about would not do anything but likely make it worse, if the extension was able to pivot freely, sure the strut would do it's job. In the end of they 100% extended the swing arm keeping the axle points on the same axis it would be perfect.

You are talking about a rear articulated carrier and yes that would work perfectly

That is exactly what I wanted to write down here. Make the suspension much stiffer and probably will be less bumpy. But the other fact that the middle of the tire will be stiffer compared to the end point of the half will also have some effect. So this will never be a smooth ride I guess.

I think the problem is not the stiffness. The problem is that the center of both rear wheels have different vertical positions, because the holder isn’t parallel to the street. If the holder of the rear wheels would be absolutely parallel to the street it would not be bumpy.

That was exactly what I was thinking

@@faindone there would probably be a difference with stiffer suspension, but not much. There is some truth in what you're saying👍

we dont need them to do great things!

I think some Guinness is required in building something this 😧

They sent this guy's photo to Ripley's they said they don't believe it 🤭

More like Darwin Award

It's a ripoff

Exactly ,

Agreed. They need to replace all of the suspension, including the front, with solid steel/aluminum. Its going to ride like crap but even if the front suspension compresses, it will cantilever the furthest back tire higher and drop down onto it so there will still be that vibration while riding. Smoothest ride will be with no suspension compressing at all.

Yes the easyest solve is to remove back suspension, or increase front

The bicycle works because there’s no suspension

Should have used the OCC bike. No suspension, no problem.

😂😂😂😂

Can´t await the Chineese copy...

Shiting bricks!

Yes, all 5 of the frames XD

I'm glad you pointed that out I never would have went frame by frame. Attention to detail in these videos is 10/10.

Heck they are Christian lol

I live around 20 minutes from their shop but their hours conflict with my work day so I’ve never been able to visit

@@bigballmagrawl0929 who knows, they still might be nice.

Yes I love that they are Christian. These guys are the best. And yes I’ve worked at a motorcycle dealership for years, ppl don’t realize how much skill and work actually goes into some of these projects!

@@MikeyritZ satans temple mechanics are also really talented.

That should do a lot. Right now when the rearmost wheel has contact and the other doesn't, the lever arm is long. When the front rear wheel has contact, the lever arm is short. Shock can't compensate that kind of force difference. Get rid of the fulcrum I'd say.

They need to leave the bike as is.

OR he could make it look like a horse

@@sycecraft i support this message 😂

This is the issue. the fact that one tire is further back causes the bucking issue. How you could mad this so the spring is in between the 2 forces I have no idea. (note the spring needs to be between the forces not between the tires.)

This....

One solution would be to replace the suspension with a fixed (strong) rod. The swingarm would no longer move, but the handling might suffer a but from that....

Simple vibration from half wheels and unbalanced weight. That's literally how vibration motors work.

Out of balance bro. You make a good point though, each tire should be longer on one side to hit the pavement before the other leaves.

I was thinking that if they relocated that rear shock over the center of both wheels that it'd be easier and better for the suspension to take it in and maybe less of a rough ride.

yep same

someone did it already

He just cut the counter weight, which was supposed to balance it

Came here to say this. Because physics.

@@midnightmassiveproductions7451 Didi this same conversation happen in another video about the same sh!t?

The leverage effect is exactly right. If these half tires were side by side on the same axle it would be less of a problem. Each half tire needs needs to be indepently counter weighted.

Yup, more leverage! In the bycicle video there is no suspension so it works. Having slightly more than half the tire might help the transition between them too.

DUH!

👆

@@user52613 Good point, you are probably right.

That's was my thought exactly. I think the connection between wheels also allows some slop.

Side by side would be a terrible idea. Imagine taking a corner.

@@Mr_Glenn yeah, scratch that for sure. It’s an accident waiting to happen.

a idler sprocket should easily take the slop out of the chain.

I’m already contemplating a t-Rex hill climber out of my KLR.

@@dumntuftv8853 Video, or it doesn't count.

@@jayrowe6473 I’ve got like 5 other projects, I’ll get there!

Literally everybody watching the video?

I'm 4 minutes in I think it won't.

Compliments to your parents on the choice engineering of your name

Me

caught me

thats not what is causing it to bounce, thats the shifting lever point on the rear arm but I agree that they shouldnt be cutting the wheels exactly in half, kinda surprised they did it that way. There should at least be a little overlap to ease the transition more

😂