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I don't believe there is any standardization of tread wear ratings. So you can't really compare a 200 rating from Goodyear versus a 200 rating from Yokohama. However, you can somewhat compare a 200 rating from Goodyear versus a 300 rating from the same manufacturer (the latter should last longer than the former--that's about all you can say). It's a bit of a crapshoot, so just go for a higher number, in your case.
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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