I've heard some manufactures "adjust" the treadwear rating in order to make a tire legal for certain classes. That might be why there's a difference in ratings.
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New Ride:
2004 Mystichrome Cobra-Accufab SBTB and plenum, Steeda 2.8" upper, Bassani X, Borla Stingers, Mcleod RXT, MGW shifter, Level 5 halfshafts, chrome FR500's, Stiffler's FIT system and DS safety loop, GT pumps, BA3000, tuned by owner
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