I have Specialized Fatboys (26 * 1.25 100psi) on my hardtail. I never really had a problem with them except for a few flats when they were new. I've had them a year and a half about and really like them. I am thinking about replacing them for this winter for some knobbies. But by spring I'll probably go back. BTW i'm 5'9 and 240ish.