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The reason the front tyre steps is because it is always resisting rotation as it's not being driven by the bike, so it always has drag on it from the road surface, particularly whilst cornering. This load gets higher under braking, but it never goes away until the bike stops. Hence it wears away the front face of the tread block faster.
The rear tyre only gets the same sort of drag on it when decelerating or braking, otherwise there's positive drive on it, even running at a constant speed. That helps even up the wear on the tread blocks when compared with a front tyre.
Then of course I might be talking cobblers.
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Skint
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