Join Date: Jul 2008
Location: Saint Louis, Missouri
Bikes: '09 Rodriguez Adventurer Custom, '08 Trek 7.3Fx
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It all depends on your weight.
From my experience:
150 to 200lbs? 28Cs are great.
200 to 240lbs? 32C's are great.
240 to 280lbs? 38C's are great.
If your roads are crap, or you ride on gravel trails much, go up a size.
Thinner is fine, unless you're too heavy and need very high pressures (or your roads are bad, you ride in the rain, or want your tires to last longer.)
If you're really heavy on too thin tires, you'll squish them down quite a lot, and end up increasing rolling resistance.
I love Vittoria Randos, the pro version is a good bit lighter, but more expensive. For even lighter with less flat protection, the Hypers are very nice.
Last edited by MilitantPotato; 03-17-11 at 04:06 AM.