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Originally Posted by Curtis73
A Michelin touring tire that is 215/60/15 has slightly different dimensions than a Michelin performance tire of 215/60/15.
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this is true, but not really a problem in the real world.
lots of people drive around with underinflated tires. this can cause a much greater variation in size than your example if one tire is 10 psi low and the other three are fine. (not that you had a bad example or anything)
most ECUs are designed to compensate within a certain amount of tire size for ABS and Traction Control ect...
you should try to get identical tires and replace all tires in pairs, but the reality is that sometimes you dont have the money to pay for 4 new tires at one time.
i'll probly get flamed for saying this, but as long as the tire is the same brand, same size and same model, the tread pattern is not a big deal in most cases.