Alright, knowing that I'm losing 8mm on the diameter of the wheel, I'm looking for predictions on available tire size. I've got a '90 Fuji Palisade that, with 27" tires was originally spec'd with 28c width tires, and can't go any larger than 32c (27X1-1/4) without rubbing something. Even with the 32's, it's a feat to get fenders in there without rubbing. I'd like to go with 700c wheels and tires for a wider tire and more fender clearance, but do you think that 38's would work? I'm only going up 6mm at most (and more likely 4-5, given that these tires are a bit narrower than 38c)...whaddaya think? I've already got new brakes that will handle it, and was wondering what the general consensus is on swapping them before actually doing it.