I always used to reckon 3 rears to 2 fronts. These days I seem to change them both at the same time. I have Distanzias on the XT. They have lasted about 4000 miles. The rear has 1k or so left on it, but the front is shot to bits. I reckon Mark is right. Compounds are much more sophisticated than they used to be, and perhaps they are using a much softer one for the fronts. Certainly the Avons are astonishingly grippy on the road and I have total confidence in the front patch.
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