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So stick with 23mm wide rims with 23mm tyres? As much as I want wider rims, I'm not really too knee in stretching a 23 tyre over a 25 rims.
HoKe-
Tubs or clinchers? If tubs, I'd go narrower than 23. I run 22c Cronos on wide 808 Firecrest tubular rims. If clinchers, then 23s on 23s. You might be able to get 23 clincher tyres on 25 rims, but I'm not going to volunteer to try it...
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I've had a 20mm tyre on a 24mm rim. It's fine.
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Two wheelset, one for track, one for crit.
I don't think there's manuy obstacle on the track to worry about riding on tyres smaller than the rims.
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It also depends on the tire shape. I have Schwalbe one 25s on my Aeolus 5 wheelset and they are perfectly aligned. I tried a Michelin pro4 23 and that also align (I only don't use them because they no longer sell them)
Brommers
umop3pisdn
edscoble
TheArchitect
Indoor track? Bugger all, I would've thought.