Join Date: Jul 2005
Location: Lowell, MA
Bikes: I just ride them, they own me.
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This is rule of thumb only. But you should get 1500 miles, more or less, on a rear tire. When changing, rotate the used front tire to the rear and put the new tire on the front.
The front tire being non drive doesn't loose much tread.
Of course, that is all rule of thumb. You should periodically check your tires (like before each ride). Cuts and gouges and abnormal wear (flats spots due to hard braking-skidding) should be double checked and may necessitate earlier tire replacement.