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Old 07-29-2011, 12:35 AM
erm
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They are on the sidewall of your tires. Also known as a durometer rating, they can range from 200 (sticky) to over 400 (hard and slippery).

Here's some info if you care to read up on it:

http://www.tirerack.com/tires/tirete....jsp?techid=48
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