I even went as far as putting a ruler up against the tread and they measure 260MM from shoulder to shoulder. I guess they are like shoes, every pair fits different. As sticky as they are I not complaining though. I took a short canyon run on them the other day and they stuck like glue. I think I need to runa few PSI less in the front as I was getting more understeer than I like at 33PSI all the way around. I'm gonna try 33R and 31F