I would (hazard) guess that the GP4ks (2) is the most widely used tire. It gets good reviews (on here among other places) as a fast and fairly durable tire. It doesn't hurt that you can buy them online for under $30 pretty regularly. Beyond that, the SuperSonic is pretty much THE race tire for those who want (one of) the fastest clinchers. Then I'd guess (in what I see locally at least) for the "sky is falling" folk, you see a lot more gatorskins than you do armadillo's /etc.

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