The first two digits refer to the inner rim width.Filled boxes designate compatibility while also providing optimal tire profile and performance. Anybody can ask a question However, wider rims have been designed specifically for use with wider tyres, the rims and tyres work together aerodynamically. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under Bicycles Stack Exchange works best with JavaScript enabled Stack Exchange network consists of 176 Q&A communities including With the right support from the rim shape, tyres become like a suspension system and really filter out the vibrations. Being able to ride with much, much lower tyre pressures can potentially help far more to make bikes faster than we could have imagined. On a side note, 25mm outer / 21mm inner rims aren't even that wide by today's standards, there are 28mm (I own a set) and even 30mm road rims available. 23mm soul s3.0 rims + 23mm Michelin SC Pro4 = 25mm tyre max width. That only tells us energy expenditure through the cranks and doesn’t measure the work done by your arms, neck or back muscles.‘It’s our aim to start doing more to analyse the frequency and amplitude of the vibrations a rider’s body experiences, and try to quantify how much energy is used – or should I say Zipp is equally keen to dive more deeply into this hypothesis for improved performance. The WTB Tire & Rim Compatibility Chart is used to determine what tire and rim width combinations provide optimal performance and compatibility. I have exceeded all the top speeds I used to clock on the downhills by 2-5 Kmh... whether it is down to better handling/less braking or lower rolling resistance I can't tell for sure, being skeptical myself about the RR argument, I tend to think it's the former.I dont see the correlation between 6" and 7" car wheels, bikes don't produce many Gs of cornering and neither do they produce 100s of hp or torque and they don't weigh 1/2 a ton +.Recently I was in Italy, doing all the climbs and descents I used to do with narrower rims/tyres.

“25mm tyres have been proven in various tests to be more efficient than 23mm tyres.

Wider rims dramatically alter your tire profile. Detailed answers to any questions you might have I have used them and was recently talking to a couple who had wider rims and 25mm tires... their conclusion... no difference in handling, marginally better comfort, but a 5 or 10psi drop would no doubt do the same thing.I am all for improvements in technology but this strikes me as, at best, marginal gain for quite a lot of outlay.I have used them and was recently talking to a couple who had wider rims and 25mm tires... their conclusion... no difference in handling, marginally better comfort, but a 5 or 10psi drop would no doubt do the same thing. ‘And it’s not a passive process. The benefits were astonishingly high; as much as 40-50 watts on rough road surfaces.’Those are big numbers to bandy around – improvements that would take a considerable amount of training to achieve in terms of physiological performance, but Donzé is unequivocal on the matter.‘We’re at a point where the rider can now save on every point. Your proposals are no where near "the edge" of compatibility. But what is less considered is how much actual energy that saves, and the subsequent effect that can unquestionably have on performance.‘All the time we’re experiencing vibration transmitted through the bike to our bodies, our muscles are having to do physical work to absorb this,’ Marchment adds. For the answer we’ll pass the baton back to Marchment.‘There are of course some drawbacks to using even wider rims and tyres,’ he says. ‘First, there’s an increase in weight, plus the fact that going wider still would present more frontal area and hence we’d have to revisit new solutions to combat the increase in aero drag.‘For the time being it looks like 28-30mm is the sweet spot in terms of getting the best of everything, but that’s not to say we would expect that to stay that way forever.

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