I have a 2003 Mavic Cosmos wheelset that's on my cross bike. I don't race and use it for steep fireroads. The 30 mm Hutchinsons didn't cut it so I got a pair of 38 mm and they're great. I have no problems with frame/fork clearance. But are these new tires too wide for the rim?
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Thread: 38 mm tire on Mavic Cosmos?