The Improbable Bulk
Join Date: Jul 2005
Location: Wilkes-Barre, PA
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It is easy enough to figure out with the bike as its own guide.
With the current tires, measure all clearance (left side, right side, fork crown, brake bridge, BB) Figure out how little clearance you're willing to settle for... For me, I need at least 5mm... depending on your riding conditions you may want more.
With those numbers in hand you can determine the max size for you. For each 2mm in tire size, you will lose 1mm per side of tire, and 2mm for the diameter (fork crown, brake bridge etc)
On my Trek 7.3 FX which came with 32mm tires, I could squeeze up to 40mm (but the rear tire needed to be deflated to install/remove).
As a caution, some tires run large, and some small, and it can be impacted by rim width, so it could vary, especially if you squeeze the clearance too close.
Slow Ride Cyclists of NEPA
People do not seem to realize that their opinion of the world is also a confession of character.
- Ralph Waldo Emerson