Michelin says that if the cracks are 1/32" deep or less then they're OK to run. Between 1/32" and 2/32" deep they should be inspected. Deeper than 2/32" they should be replaced.
I replaced our XZE's after 8½ years which was a little sooner than I wanted but the 305/70's I needed on the front were in short supply so when they came in I jumped.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Lifetime GS Member, SKP, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
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