multimodal commuter
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,808
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
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I don't think a 28mm tire will cause any problems. I think you could go wider than that. Finding a wider tire may be a challenge, though.
Is this your only bike? If you have another bike, one with 700c clincher tires, try fitting the other wheels with fatter tires; you'll see what the limits are.