Wow, what have I stumbled upon here? Expecting a cozy Brompton bike channel made by a friendly elderly couple, proceeds to be an absolutely STELLAR explanation of advanced bicycle riding physics. The friendly and clear narration, the positive yet calm music, the consistent and considerate use of standard units (and their translation), the absolutely mindblowing animation (so clear, so detailed!), all of that in one great package. Rarely have I been this impressed by content on KZfaq; thank you so much.

As a rider of both, I found this very informative. Thanks! You forgot scenario 3 where the Brompton rider decides they don't feel up to the 60km ride, spends a very efficient 30 seconds folding up their bike and hopping on a train to the destination, and having several celebratory beers and a full course meal before the road cyclist reaches the destination. This is one reason why, although loving my road bike, I'll never get tired of my Brompton!

How can anyone condense so much information in such a pleasant and engaging video, with a perfectly written script and beautiful animations... I am stunned! There's no one else on the face of this planet even attempting to make such informative videos on YT, I'm glad we have the two of you!

This is how math teachers make learning come alive and relatable to real life.

Wow, this is a Sheldon Brown level of both very detailed physics information and a presentation that makes it very accessible. Great job!

I am so going to use this in my Physics class this year! I teach about rolling resistance and aerodynamics, but always in relation to cars. The info graphics and info here are absolutely fantastic. Thank you!

I am so absolutely stunned at how amazingly marvelous, informative and just absolutely brilliant your videos are... Someone should be nominating you for an award 🏆🏆 Many many thanks ❤️

I've seen dozens of videos explaining all of this in one form or another, but this was the best and clearest explanation I have ever seen. Thank you for putting this together. Your teaching and illustrating skills are amazing.

This was totally not what I expected when I clicked on this video. This was a very well made and very informative video. Hope to see more these kind of videos fro his channel. 👍

Holy moly! I'm really into this stuff inside the competitive cycling world and I watch all the youtube channels that are for "serious" or more racing oriented people and this content is 1000 times better presented, more useful, and more scientific than what I normally come across. I also learned a few new things. Amazing video!

This video is absolutely incredible! Thank you so much for producing this kind of content.

I've been a lifelong road bike rider, primarily on bikes with 700c tires. I bought a Brompton about 6 months ago due to 1) desire to travel by air and bring my bike with me, and 2) many years of arthritis in my hands has finally convinced me to move to a less painful riding position of the Brompton, which requires less weight on my hands. I love my Brompton more each time I ride it, due in part to so much less hand pain but also because I just find it quirky and also find that I'm riding a bit slower and just enjoying the slower more deliberate pace and the curious looks of the people I pass. I've wondered what the actual differences were in speed and performance compared to my very fast carbon road bikes, and this video has answered those questions with remarkable accuracy. Thanks so much for making these great videos.

My goodness, this is absolutely stunning stuff. Production value!

Holy cow, this is the best explanation of bikes on youtube

This was the most detailed video on this subject i have seen. Well done

This video is a gem. Very well researched and a master class on what influences speed on whichever bicycle. Very well done!

So much effort behind this video, thank you for your hard work!! Still the comfort and the convenience of the Brompton seems like a fair trade-off.

The best video on the topic I've seen so far. Thank you!

Fantastic graphics. Brilliantly researched and presented. Well done!

The most informative and enjoyable bike channel I've ever found on youtube. This upload is simply amazing. Subbed...

Exceptionally informative. One of my favorite videos on KZfaq ever, saying that as an engineer who's been watching a lot of informative engineering videos since years.

Amazing video and explanation! More than what i expected for sure! Thanks for the effort and beautiful illustrations

Fantastic video packed full of great information. Thank you!

Easily one of the best explanations of the factors affecting bicycle performance I've ever seen! Five thumbs up! And thanks!

This is an amazingly well structured and informative video. My mind is blown - thank you!

Wow this was wonderfully informative. Way beyond what I expected when clicking on the vid. I ride a Mountain Bike primarily for cardio calorie burn, it's better for my purposes than a road bike because about 1/4 of my daily circuit is off of the paved roads. I have a salvaged BMX that I use for my backup bike (when the primary bike is down with a flat, etc. and I don't have time to fix it before my riding window) - and I'm planning to replace my BMX with a Brompton style folding ebike, so was doing some research on how they ride. This was a great vid, thanks for diving deep in your analysis. Have an awesome weekend!

Wow I clicked this video out of curiosity and came away genuinely surprised and pleased by how informative it is! Thank you! Learned a good deal about bicycle mechanics

Learned so much from this video. Thanks for putting this together.

What an excellent and very understandable explanation on the different efficiencies of both bikes. Well presented, thank you.

I'm always so happy to see your videos! They're so detailed, well researched, and your graphics are excellent. I was watching your video and my husband overheard and was immediately fascinated. He's an engineer so it totally appealed to him. =)

This is the best explanation and with a very good use of graphics to make understanding easy.

This is just fantastic! Love how you break it down into straight physics. Thanks for this amazing analysis...has applications to a lot of types of riding!

Wiw! 😮 I think I have just arrived at "explanation heaven"! ❤️ That has got to be the most wonderfully presented explaination on this topic that I have ever seen (and I have seen LOTS!). The slow pace of transition from one frame to the next, and the moderate pace and the very clear diction of the narrator meant that I understood everything without having rewind or replay numerous time. Added to that was the calming backing track and the dulcet tones of the narrator. A joy! ❤️ I really do think the narrator would make a great living doing voice-overs or making instructional videos for a variety of clients. Awesome. Thanks. This video was so good that I have now subscribed to this channel just so I can watch more videos (no matter what the topic is! 🙂👍)

Brilliantly explained. Both the bicycle enthusiast and physics teacher were completely engaged. Thanks.

Thank you for a very informative and well made video! Absolutely loved it!

this is the most educational video about bicycle that i found on the internet, thanks for producing this kind of content

Extremely well researched and presented. thanks!

What an EXCELLENT video! EXCELLENT graphics, EXCELLENT physics, beautifully illustrated and narrated. And about 500% better than I was expecting! Thank you so much! And a special bonus someone who can actually pronounce derailleur in French! Now that Brompton has a 4-speed derailleur we lose the friendly Sturmey-Archer 2nd gear, I think. All the best, Rob in Switzerland

Wow, love this video. Now I know why I prefer to tour on my Brompton; more time to smell the roses.

What an educational video. I don't ride a Brompton or any other fold away bike but I do ride a flat handle-barred so called hy-brid. I have 3 cranks and 7 speeds at the back being 28, 38 & 48 over 34, 24, 21, 18, 15, 13 & 11. I know intuitively that I will always lose out to "racers" because of their aerodynamics - but i just wanted to say that even though I don't have either of the 2 bike types mentioned in the video, I learned something. The most important thing is to get a bike you like and enjoy riding it. My friends keep bugging me to buy a racer - but I just prefer "sit up and beg" over bending forwards for hours looking through my eyebrows! The main thing is that cycling is healthy and good for the environment. Happy safe cycling everyone. Have a great Xmas & 2022!

Oh my good god! Learn something new everyday...thank you Mme Pam!

This is shockingly well put together

Wow, this was an unexpected pleasure. Great video!

Thanks. Very informative. The difference is less than I anticipated. There are other high performance folders such as the Canadian made Helix. It has 24" tires but folds remarkably compact and is much closer to a full sized bike in performance.

Stunning vid. Thanks for this accurate analysis.

What a delightful instruction and diagram set. Kudos!

Marvellous work, thank you! In practice I find my Brompton pretty similar to my road bike in terms of speed, maybe because I normally have the aerodynamic load of panniers on the latter, as opposed to a rucksack in my slipstream on the Brompton. I proudly remember one occasion when riding my Brompton, I found myself with a couple of club road bike riders slipstreaming me :-). I was fortunate enough to compete in the Brompton World Championship once, too -- and that felt like pretty scary full-on bike racing, with welcome straw bales on the corner obstacles. Thank goodness the tarmac was dry at least, as cornering traction is not a Brompton forte...

Thank you for the great video, really professionally made

Even a road bike rider could be benefitted by this video,awesome job!

Very informative video, thank you so much, now I can relate to my experience using both type of bikes

Amazing video, incredibly informative! Thanks for sharing!

I did not expect this when clicking on the video thumbnail. Needless to say, the video completely blew me away, too!

Excellent work. Thanks for a great explanation of why I prefer my road bike with panniers over my Brompton in even short commutes to work- except for the cool factor in riding the Brompton, which is worth several km per hour!

Wow. That was very interesting and puts it all in perspective. Thanks.

Really informative. Thanks for sharing.

I've pondered this question for years. Incredibly informative. Thank you. But there's one variable you overlooked. Since the Brompton folds, you will sometimes be able to ride when you would otherwise have to walk. In such a case, the Brompton will be much faster!

I clicked on this video hoping to learn something yes...but I wasn't expecting was a whole ass maths lecture lol. In all honesty, thank you for this insightful video. Safe ride everyone!

Awesome content, so clear and informative.

Very clear explanation and very informative. Thank you

Amazingly well done video. Thank you!

Another insanely informative video 👌

What a brilliant piece of work. There has long been the "Bromptons are dead slow " type comments, but your calculations stack up with what I have found in practice. My P6R and old 1980s 5 speed "racer" show differences in average speed in the 1.5 to 2.0 mph range. Pretty close to your calculations. I must add though it depends greatly on the rider, when commuting on my Brompton I used to enjoy passing the lycra clad fancy road bike riders and wishing them good morning etc 😁 Can't do that anymore sadly!!!

Excellent work 👏

Wow the information on this video is impressive! Well done!

Very informative and well put together

Wow this is the most detailed and well explained video I have seen on bicycle power efficiency, very impressed and unexpected. Honestly speechless.

The best tire review for 16 349 . Thanks !

Fantastic video. You are a great teacher.

The animations are awesome as well 👍🏼👍🏼👍🏼

Nifty, I am a die hard roadie but i respect the small bike world even if I choose something more suited to my strength.

Excellent and unexpectedly detailed but comprehensible explanation!

This is the most awesome video I’ve seen on this

Sounds surprisingly clear and logical. Very informative.

You are so amazing with your videos and physics lessons! Bravo!

Perfect explained! Thank you.

You did a ton of work for this video. Good work.

Omg. Very detailed and informative. Kudos!

Thank you for another great and informative video! Your video on handle bars helped me solve a problem I had with Brompton S6XL which now has the shorter M stem . I converted this bike to a single speed 58t x12t and it is very fast indeed !

AWESOME VIDEO 👏🏻👌🏻!!

wow, this is a master degree essay, thanks a lot

wow, this is mindblowing analysis! amazing!

Awesome video! great content

wow, amazing presentation and analysis

Thank you for the amazing explanation!

I stumbled upon this video after viewing GCN's Brompton vs road bike video. Thank you very much for this well montaged explanatory video.

This was superb, thanks.

I love how informative and yet accessible you make your videos with the visuals and the thorough explanations. Are you an engineer? Thank you Pam, you're amazing!

i know nothing aboutthe channel, just watched first time, SOOO VERY INFROMATIVE AND VERY GEEKY NERDY I DUNNO!!! SUBSCRIBED INSTANTLY :D

Wow, I didn't expect such scientific and detailed review, nice one!

Fascinating video, thank you.

What a great piece of graphical explanation! THanks! Been riding MTBs for decades - and in the recent years advocating against the recently popular 1x12 systems, mainly because shifting upwards under heavy load (when experiencing sudden steep uphill) is nearly impossible, while dropping a cog or two by the front derailluer is almost instant and effortless... Another point being - if I have the biggest sprocket in front at 44 and smallest at rear at 11 (golden standard in MTB for decades up to recently), I'm still limited at max speed slightly - while in my 29 inch MTB I have 3x10 with 48 and 11, which means I can overtake almost anyone on the road... Which is perfect, but bikes (especially frames) like that are being phased out, esp. in higher end stuff. The problem is new bikes don't even allow to have several sprockets in front, relying solely on smth. like a 36 or 39 max at front and going down to 10 in the back... Which kinda seems all kinds of messed up. IN addition to that, as I see now in the video, there's more friction, also, in smaller sprockets, which proves my point - don't change what's been working since Gary Fisher. So they better watch out, those big manufacturers - I got the facts now! Nah but seriously - not being able to buy the sprocket combination I want for my own money bums me out. Greetings from Latvia - you've got yourself a new subscriber.

What an excellent video, thank you!

Outstanding analysis! 👏

Great analysis , good job

Excellent, thank you. On the flat, I can usually keep up with a casual road biker. It is up hills that I fall behind. I consider this to be due to the difference in wheel size offering different momentum, with the smaller wheels size having less....thanks

Superb video. I'll comment and like hoping for this to trending. Keep it up!

this was unexpectedly informative, thanks!

This is a ridiculously good video. Thank you. Very very impressive

really excellent video. Thanks!

Very informative!! Amazing video as usual. Cheers 🍻