as noted, quality tires with carbide studs will last a long time. peter white cautions against riding aggressively on bare pavement due to the risk of damaging the tire, pulling studs out, etc. but in the past 2 years on my nokian w240s i haven't had a single problem and haven't babied them at all. stoplight sprints, incidental skids, hard braking, any type of riding you'd do in city traffic. i'm just saying