Re: Difference? Middleweight/balloon Schwinn
it's really a trial and error process. as in, the only way to find out if it works is to try to stuff the bigger tire in there. i've had bikes that fit larger tires by a few mm, and i've had to use different size sprockets just to get the wheel back enough so it doesn't rub.
you still have the problem of the 1 3/4 tire, though. i dunno if anyone makes anything wider in that oddball rim size.