Well you are supposed to change a tire when it gets to the wear limit but you can actually run quite a bit farther. If you run it smooth be careful in wet weather when the tread is gone.

As far as wear time, that really can't be answered simply. In addition to the road conditions there is the way you ride and the compound the tire is made of and even the weather. A tire will wear a little faster on very hot roads than on cold roads with the same rider/tire/road surface. Then there is also the weight of the rider and bike.


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