Excellent question. When we discuss tire sizes, we always speak in terms of the maximum tire size. In the case of the Fastlane, we figure the 40C tires, though the geometry is really designed for 32C's. Install 25C's and your steering gets quicker and your bike lighter - an easy way to give your commuter a sportier feel.
Regardless of which tire you select, you won't have any interference issues because of the brakes. Indeed, with disc brakes, you don't have the problem of the calipers not opening up wide enough for the tires.
Thanks,
Richard
_________________ Richard Schwinn
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