Is a rim built for a narrow range of tire sizes? I have a Trek Hybrid with Bontrager rim and 700x35 tires on it and I have noted that 700x35 are not as common or easy to find up in a LBS as the thinner tires used on normal road bikes. In fact all the web sites who sell tires say that the Bontrager Select Invert tires I have have must be picked up (no mail) at their shop.
If I blow a tire while on a trip with no 700x35 tire available in the small town LBS, what tire size should I be able to substitute with my rim? 700x28mm? 700x38mm?
I would like to find a foldable tire in suitable size to keep as an emergency spare. I have not found a foldable 700x35 so far.