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Old 02-08-2002, 10:12 AM   #1
GooseMan
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Member#: 2462
Join Date: Sep 2000
Chapter/Region: SCIC
Location: Los Angeles/Montreal
Vehicle:
2012 Volvo S60 T5
2005 Triumph Sprint ST

Question H-R-W-XYZ....ratings..what do they REALLY mean?

I'm planning on getting a set of Kuhmo 712's this spring, and I can get a good deal on them. The W rated ones are about 40-50 bucks cheaper OVERALL (for all 4) than Z rated.

I know that the ratings are heat ratings for maximum speed (for instance, W is only for 100mph, whereas Z is for 149+ mph (I'm just making those numbers up)).

I rearely go over 100mph, so I dont really NEED Z rated tires....or do I???

Do Z rated tires actually have better GRIP than W rated? I guess they would be more heat resistant, but is the compound actually grippier? What benefit would I have with Z rated? Should I pay the extra cash?
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