This is a question from a newbie. What is the life expectancy of motorcycle tires? I have 5k miles on my 06ZZR600 and my tires are showing no visible signs of wear and I frequently measure the tread depth with a tread depth gauge. I'm a mild mannered rider (no racing, wheelies, etc.). From what I've heard from other riders I should soon be replacing my tires with that kind of mileage on them. I don't know if the other riders are riding more aggresively than myself to cause premature tire wear. I don't want to risk my safety by running a set of tires for too long, but I don't want to waste money by replacing tires that don't need replacement.