Ray O wrote:
> "Bill Putney" > wrote in message
> ...
>> Ray O wrote:
>>
>>> The UTQGS was developed to provide a uniform method of comparing tires,
>>> and since mileage ratings are not part of the grading system, tire makers
>>> have and use mileage ratings for "wiggle room" in their marketing.
>> You're saying the mileage ratings (400, 620, or whatever) are not part of
>> the UTQG? UTQG is only temperature and traction ratings?
>>
>> Bill Putney
>> (To reply by e-mail, replace the last letter of the alphabet in my address
>> with the letter 'x')
>
> The uniform tire quality grading system has a treadewear rating with a
> control tire assigned a rating of 100. A tire with a rating of 400 would
> have a tread life that is 4 times the control tire; a rating of 620 would be
> 6.2 times, etc. Mileage is not necessarily the same as treadwear due to
> differences in tread pattern and tire circumference, so rather than list
> expected mileage, they compare tread wear.

Ahh - got it. When you say mileage, you mean when they state that "this
is a 75,000 mile tire". Thanks.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')