[Jeff Teuton]

Jeff, I assume that is a Michelin (they got them oddball 80's). Pull up the specs on the net and look at diameter of what you have and revolutions per mile to see how much effect it will have on your power etc. Yes, the 11/22 is about the most common out there, but the 275 is becoming more available. Firestone took a good Bridgestone (both owner by Bridgestone) and renamed it a Firestone and shortened the price and only make it in the popular sizes. Worth looking at.