Thanks to all who replied. I found a "Optimal Tire Sizes" chart at the bottom of the Web page listed below that uses a formula like George pointed out. http://www.musclecarclub.com/library/tech/wheels.shtml Thanks, Gary H. -----Original Message----- >From: george smith < >Rule of thumb used to be the wheel should be 70% of >the width of the tire. ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.