thanks for the replies guys. i'm gonna mount up a friends m/t 315's and see if maybe bfg's 315's(i used to have a set of them) were a little smaller than m/t's. i know alot of times the actual size of a tire can be much different than printed on the sidewall! i hope that m/t makes their tires on the bigger side, and i can use the 315 from them.that sure would make life easier!!