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Discussion Starter · #1 ·
Is there a pattern? Does the number indicate grip or compound softness or something? Or application perhaps? Maybe this was answered elsewhere.

My Cayman came with 20" wheels and PS 4S N0 tires. I like them. Haven't found their limits yet, don't know if I need to, don't have many opportunities. But I'm curious what the 0 and all the other numbers mean.
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