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Old 02-08-2002, 11:37 AM   #4
Scooby Specialist
Member#: 8972
Join Date: Aug 2001
Chapter/Region: E. Canada
Location: Ottawa
2003 WRX Wagon


You've got it right in that it is resistance to heat buildup from
friction, and the resistance to flying apart from centripetal
acceleration. Traction is traction, based on the UTCQ (?). and
shouldn't matter from one speed rating to the next, but the
higher up the the chain you get, the better the construction of
the tire to resist the effects of speed.

In general (my opinion) nobody needs a Z-rated tire for the
street. You can get a decent tire with anything over a Q-rated
tire. The ratings are also based on continuous use, not just
blasting up to xxx km/h and back down. If you are really into the
"performance" then you can get a H or V-rated tire for less than
expensive Z-rated.

My 2Cents.

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