Both, or rather - the depth of the tread of the front tyre was reduced by Metzeler to get the same mileage as on the rear But the way you use your brakes does influence the wear as well ;o)
In past times you got loads more miles on the front tyre. On my old Beemer I used to do about 10 kkms in front and 6 - 7 kkms on the rear with the Tourance. So when the change in the tread became apparent I changes the tyre brand.... No more Tourance.
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Only when we pause to wonder
do we go beyond the limits of our little lives.
(Rod McKuen)
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