I’m getting ready to set up my ENVE Foundation 45s for the upcoming road season and debating whether to run 28s or 30s. Either tire would be Continental GP5000 S TR, running tubeless. Wheels are going on a Cannondale CAAD 13, so sticking to the manufacturers maximum size of 30mm. Thoughts?

Everyone above is correct. 30 (or possibly wider) is the better option if you can match the wheel profile to your tire size. You’ll pay an aero penalty for going wider than your wheel though. It’s not enough to rule out other considerations but could make a difference in certain conditions. My v…

[image] WindWarrior: The chart he posted included impedance loses. Did you look at the graph? Of course I looked at it. But I noted the “Crr” Y axis and didn’t realize/remember that Josh uses impedance as synonymous with suspension, so I missed what he was saying. My mistake. However… having…

[image] WindWarrior: Nobody going to resolve differences until you take your wheels and tires outside and test. Well, that’s just ridiculous. I’d have to ride my bike which is not part of my training program for getting faster by optimizing equipment in hypothetical scenarios.

There is no weight difference I have GP5000 in 28 and 30c and they weigh exactly the same. Also on my regular route my fastest time was done on 30mm tyres

Any of you guys been outside for a ride today? Cabin fever abounds.

[image] kervelo: Silca calculator suggestions are useless, because they don’t take the rim width into account. The pressure for a tyre installed on some old 17 mm rim is totally different than for a tyre on 25 mm rim. The widget says to use measured tire width so it accounts for rim inner wid…

[image] Junk_Miles: I must have missed where I said this. I guess I’m just used to riding in the real world on real roads rather than in a testing facility I know you didn’t say it because everything I’ve told you is correct. That’s my point. Clear advantage for 28’s on that wheelset, just…

" He also shows the breakpoint where “…we learned that Tom Anhalt’s data was repeatable, and impedance does in fact dominate the rolling resistance beyond the breakpoint pressure”" Negative. You are showing theoretical data. Impedance losses start at over 100 PSI. This is actual data from Silca.…

[image] Junk_Miles: [image] Brennus: If you have some evidence that heavier things are faster, just post it. Huh, I must have missed where I said this. Did I say that? I don’t see anywhere in this thread where I said that. Are you making things up now? :smile:

[image] WindWarrior: these guys did at two representative powers on nearby roads Yes that’s a great video! However, two critical things. First, the internal width on the wheelset in that video is very different from the OP wheelset. And the wheel depth. So not apples-to-apples. Second, a…

Which tire width? (28mm vs 30mm)

Equipment

AgingCannon April 5, 2024, 6:56pm 73

I’ve done my share of arguing for today, and I think this particular discussion has run its course as well. I’m going to take your advice and head outside.

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Which tire width? (28mm vs 30mm)

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