And if there is a drastic difference, the tire shop can shave off some of the tread to bring it in line with the other tires. Tires with an extensive difference can affect rotational speed causing extra wear on the systems as a attempt to compensate. If your unaffected tires are at 5/32" or less then I recommend replacement of all tires. Most shops will give you cash back for used tires as long as they have 5/32" tread.
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