A buddy of mine went 12 years on a set of tires. Then one day the left inside rear blew going down the highway. The flying tread took out both his gray and black tanks, the tail pipe and part of the side wall. He could of bought several sets of tires for what he paid in repairs. I don't think he will ever go over the 7 year mark again. I know I won't go pass the 7 year mark.Penny wise, pound foolish.