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...greater adhesion to the road surface, but it also has a lower [[treadwear rating]]; ''i.e.'' it wears out much more quickly than the harder rubber tires use ...ot only DOT approval, but also a minimum [[Tire#Automobile_tires|treadwear rating]], in an effort to eliminate the R compound tires from competition and requ

...(collectively known as [[UTQG rating|The Uniform Tire Quality Grade (UTQG) rating]]s). * Speed rating - one or perhaps two letters (see table below).

[[Automobile]] tires have numerous rating systems. See [[tire code]]. New automotive tires now also have ratings for traction, treadwear, and temperature resistance (collectively known as [http://www.tirerack.com