I have a 2005 FXST that had a 150 tire on the rear stock. I was able to fit a 160 on the rear with enough clearance between the tire and belt. Beware of the tire rubbing inside the fender if the suspension squats alot ( launching off the line and/or a passenger on the back too). I had to adjust my suspension preload to keep it from rubbing. This did create a stiffer ride though.