OK, thanks! Not too sure on the guess and check system, but as a bigger (as far as bikes go, 205#) guy, not too sure I want to roll on 1 inch tires either Maybe Ill give the 1 1/8 inchers a try on my next Niagra order. I picked up a cheap Le Tour III at the Salvation Army today that I don't want to put much money into but that could use new tires, so at least the 1 1/4 inch wont go to waste!