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there is no diffrerence...more (archive)
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Posted by Aaron@Tirerack.com on November 01, 2000 at 07:08:33:

In Reply to: Aaron, ?'s about Kumho's posted by AL on October 30, 2000 at 18:46:49:


The w and z rating are the same actually. Any Z rated tire is specified to go at least 150mph and above. In many cases this really means 151 mph. The w rated tire is the same as a z rated tire, but the manufacturer is bragging that it can be used up to 168 mph. Thus, all w rated tires are z rated as well. Hope that clears it up for you. If you need me to get you set up on some 712's, let me know direct @ 800.428.8355 x395
thanks
Aaron

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