Відео

Alex I have a question . I have knobbies tires on my 26inch wheel mountain bike . The knobbies are 12 mm in length and width and 10 mm apart . When I'm riding on the road I add more pressure to the tires so only the center most section is touching the road . When me and my road bike riding friend start off on a black top hill and neither one of us touch the pedals I can get to the bottom of the hill faster than his racing road bike with the skinny road tires . My bike weights more and I weigh more . Is it the weight that makes me go faster down hill or is it because I only have 106 12 mm patches of rubber touching the road in one full rotation ? Would you do a knobbie tire test vs a solid rubber tire .

Hi, great video. When you set up Zwift, which trainer did you select? Or are you now using the unlisted option? Do you get maxed out at 400W?

One more thing... What makes you think the amount of 'drop' determines comfort? It's an incorrect assumption, and absolutely does not. Pressure determines comfort over a given surface, but pressure is not constant. A large volume will have smaller pressure variation, so will be more comfortable because the pressure in a smaller tire spikes progressively as bump sizes increase. Sorry, but you misunderstood nearly everything about rolling resistance, except the fact that for given pressure and weight give nearly identical contact patch area, unfortunately the rest is completely incorrect conclusions. If it was my video I'd take it down and redo it with correct information.

why is torso angle not working in calculator

It’s a cheat if you compete. Otherwise, it’s an assist. A hundred miles in a day used to be easy for me. Now, in my seventh decade on this planet, after a major organ surgery and multiple crashes over the years have taken a toll on my back, 30 miles is more the norm. I can still do a century, but it wipes me out for a couple days afterward. An assist on the tougher uphills, and into serious headwinds? That would be welcome.

Moose 😮

Best video out there, nobody is riding different widths at the same pressures but all testing is done with same pressure giving false results.

Sub 20 minutes 5km time will put you in the top 3 to 5 in a local race. This dude is right. Some genetics is involved.

I recently put some old 53/39 biopace chainrings on my TT bike and rotated the chainrings 72 degrees (one hole) counterclockwise. It seems to be working for me. I'm going to run this configuration for a couple of weeks and see how it affects my Wednesday Night Time Trial Series times.

Ceramic and hybrid ceramic bearings definitely save a considerable amount of energy, but how much depends on the OEM bearing seal type, ball grade, ABEC precision level, ceramic ball type, race material, and type of lubricant. I even have data that shows a tungsten disulfide coating applied to bearing races will save up to 5w. I sell hybrid ceramic bearings for ebikes that improve the range up to 20-25% with the full kit and a *lot* of data to back it up 🙂

Shorter is better for ultra distance. Much less pain in knees and hips for zero cost in speed. I am moving to 150 cranks from 165s to further optimize. If I was riding normal distances I probably would not think much about it.

Who here rides 167.5😅

I didn't know you could directly map VT1 to LT1 and VT2 to LT2 like you are showing at 6:00. Are you are this is correct? Thanks

Playing with that calculator made me understand why and how I got overtrained in the past 2 weeks. Somehow, it never occured to me that I should not do long rides at near FTP power. It's so simple but so easy to miss! Bless you! PS: it would be nice to have an elevation gain parameter that estimates the extra energy needed on the ride.

Al anciano ese no le conviene porque él tiene carro, por eso se la pasa ladrando y gastado oxígeno

Great. It would be nice to completely understand all of this. This is a start. Thanks.

Helmets are necessary because cars are dangerous. Cycling itself is less dangerous than walking down a flight of stairs.

Still riding my urb 8.9 after 5 years daily commuting. 🎉

Is the electronic groupset/shifter the new standard for Tour De France road bikes?

I think this is rubish..i have asthma and any strenus energy i use i need my ventolin inhaler

Wider tires a just better. I went from 19 to 23 to 32 now I ride on 45mm, way better cornering, way more stable on descent, way more comfortable, way better on imperfect surfaces, off road. All this make it just as fast as I have ever been in some cases faster.

100% Cav....he went for a hole that wasn't there....

I find with my knee height at the top of the stroke, there's an amount of knee drop where I have the most power and comfort. Then, if I'm stretching at the bottom of the stroke , I need a shorter crank arm.

Eat your words lol

There is no single formula that is correct for millions of riders. First you need to do the 5min all out before the 20min. Then the percentage depends on your fitness. It can range from -15 to -5%. Much better do 5min and 20min and then use CP from Monod Scherrer calc. It takes into account your personal power degradation curve and gives very good results.

Where is the calculating website? I wanna use it. Is it expensive

Was a Squirt user, wished I'd gone to immersive waxing when I first saw this. Got Silca's melter and wax, much cleaner and lubricates chain beautifully.

I guess that most people these days are not runners, they are joggers and they love zone 2 so much that the only time they actually run is 5k race which does not work out for them as they wish it did.

Comparing like for like is the only way to make a comparison. I think rolling resistance is being mixed up with frictional resistance and vice versa, in my opinion. Unless, you're racing for money does it really matter that much?

Had a 89 Dave Scott centurion with a biopace.. the bike was an absolute WEAPON in the flats on a TT

what do you think about light (less than 60g?) QR/skewers (for Specialized SL6 rim brakes). From testes, looks like light (external cam most of the time) skewers have 30-40% less clamping force, does it affect handling/frame stiffness ?

This is the best video I’ve ever seen on time trials

The individual tire design is what counts.. they may design the wider one to inflate to a point.

Will running on a treadmill with an incline hurt my run time on flat ground outside?

My Gravel bike came with GRX 172,5 cranks from the manufacturer. At longer rides I feel very uncomfortable knee pain which I didn’t experience with my trekking bike with 170 cranks. Unfortunately, the smallest GRX 600 cranks available are 170s. Do you think going down by 2,5 mm from 172.5 to 170 will produce a noticeable difference for the costs? I am 178 cm tall with long legs and an 87 cm inseam. Or can you recommend any cranks other than from the Shimano GRX 600 series that are available with shorter cranks and would be compatible with a a GRX 810/600 2x11 set?

Biopace fine standard

Unless your in the UK, then tractor tyres are needed.

This is one of the better explanations I have seen in the 4 decades of battling marketing-based theories of CRR and tire section. Even some of the brands mentioned have stated clearly opposite opinions 20 years ago. The story is much more complex and nuanced than he explains in this video, but he only has so much time to explain this and it is very complex stuff.

As with most things subject to physics and the ever evolving technology and materials, the marketing is over-simplified for the purposes of selling changed products, while the actual truth is extremely nuanced. Advantages in bicycle technology are very incremental and nuanced, as most things design-wise are very mature at this point.

It’s not respectable if you’re under 50 with no underlying health issues…and if it’s not obvious it’s downright pathetic

I'm still riding 86 motioncraft with biopace crank, very smooth for me, love it.

You are of course right, but the whole point of running wider tyres is due to the fact you will be running them at lower pressures. As you've noticed when inflated precisely to the proper pressures for a given system's total mass, both - wide and narrow tyres will be running with exactly the same rolling resistance on smooth surfaces (like testing drums). The issue is, that the surfaces we are riding on are rarely that smooth. Hence even on the tarmac, a wider tyre may provide benefits, though on good quality asphalt, those will be very marginal gains that can be nullified by worse aerodynamics of the wide tyre. Knowing that wide and narrow tyres will have the same rolling resistance when inflated to the proper pressure, I would choose wider tyres in most instances due to increased comfort, better grip and so on. I would make an exception probably only for a velodrom.

Thanks for the great interview about the icu. I'm from Brazil and I just introduce the web page to my coach. Congrats!

Do still have the same opinion? Guess time changed physics.

Thanks, my taste and opinion is that the BMC would be better if hot pink or bright orange but on a lowest part of frame and forks then above black🦾

The only problem with tubeless tires is that the sealant used is only good for 3 months, after which you have to add more sealant which will increase the weight of the tire which supposedly hurts rolling resistance, but you say weight doesn't affect it. On my touring bike, I had tires that weighed 1000 grams each, I switched to a 550 gram for each tire and there was a noticeable improvement in the speed of the bike.

WARNING!!! Same 15 sec music clip over and over again for all 20 mins. Be warned.

I remember seeing the first video about the Ceramicspeed shaft drive idea. It took me seconds to consider the huge side loads on the rear sprocket and that it could never come to market.. Yet another investment scam of which Elon Musk would be proud.

As someone who ran 19:21 in the 5k at 16 years old with just about 2 months of experience, running a sub 20 minute 5k isn't easy by any means, I just had good genetics and patience, plus the help of the course being pretty quick, (I ran 20:34 on a course that had a lot of hills so the courses play a big part as well), hardly anyone who has never ran before and has not that much fitness history or is really overweight is going to find a sub 20 minute 5k easy, hell sub 25 5k is difficult for a lot of people, so sub 20 is pretty fast for most people.