tire replacement - single or pair
#1
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I just bunged up a rear tire, a Bridgestone RE050PP. It currently has a good 8/32 of tread. New ones have 10/32. Replace them both and have a spare or just the one?
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How old is the tire? After 2 years the old tire will have much less grip than the new, making for squirrely handling even at street speeds. Same story with replacing the rears more often than the fronts.
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Car will pull to one side under accel and decel with the difference in diameter
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IMO, particularly with staggered fitments that can't be rotated front to rear or in most cases side to side, it simplifies things over the long run to replace tires in matched pairs. In addition, as others have alluded to, tread depth is probably not the best gauge (no pun intended) for tire replacement. Age, storage conditions and number of heat cycles is more telling from my perspective.