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Tread depth after 15k miles
Had the 175-70-13 tires on my VX rotated and balanced after 15k miles Wednesday.
Two front tires (now on the back) average tread depth .215. Maximum variation no more than .010.
Two rears (now on front) average tread depth .250. Maximum variation no more than .010.
These tires were inflated to 44 PSI since they were installed new (sidewall max).
No consistent variation between the outer and center grooves (3 grooves per tire).
At least for these Michelin X tires inflation to sidewall max has no effect on increasing or decreasing the amount of wear from the center groove compared to the outer grooves.
Checked with a dial caliper.
regards
Mech
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