Is it possible to put a 700 x ?? tire on a bike that is currently running a 26 x 1.95 tire? If so...any good recommendations for a lighter, smooth-rolling, puncture-resistant, thinner tire for an older Trek Navigator 200? I'd like to start using this bike to commute to the gym...but the knobby, fat tires on it are sluggish and heavy, not to mention old and probably rotted. If a can't use a 700 tire, then what would be the best 26 x ?? tire to put on the bike for my intended use? Thanks!