What's the *Tread Wear Rating*?
10-14-2002, 05:59 PM
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What's the *Tread Wear Rating*?
The 2002 Autocross Solo rulebook says that, for STS (and IS3), tires must have a "minimum tread wear rating of 140". What's a tread wear rating? How do I know which tires do and don't have it?
10-14-2002, 07:02 PM
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It's a rating given to a tire to give an approximate life span of the tread. It's on the sidewall of all street-legal tires. Higher numbers last longer, but will usually have less grip.
10-20-2002, 12:23 AM
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ok, but wouldn't that vary between tire brands? I mean...Toyo and Kumho may both have a "200 tread wear rating", but they could be entirely different simply due to the rubber composition, tread shape, etc...
10-20-2002, 12:37 AM
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I'm pretty sure the tread wear rating is standardized in the tire industry. Either way the tolerances should be pretty close to one another. You running STS? Seems like Azenis are the tires to get.
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10-20-2002, 12:55 AM
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Originally posted by AwwsChwA
ok, but wouldn't that vary between tire brands? I mean...Toyo and Kumho may both have a "200 tread wear rating", but they could be entirely different simply due to the rubber composition, tread shape, etc...
ok, but wouldn't that vary between tire brands? I mean...Toyo and Kumho may both have a "200 tread wear rating", but they could be entirely different simply due to the rubber composition, tread shape, etc...
10-22-2002, 09:43 AM
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Originally posted by Shingoblade-GSR
I'm pretty sure the tread wear rating is standardized in the tire industry. Either way the tolerances should be pretty close to one another. You running STS? Seems like Azenis are the tires to get.
Shingo
I'm pretty sure the tread wear rating is standardized in the tire industry. Either way the tolerances should be pretty close to one another. You running STS? Seems like Azenis are the tires to get.
Shingo
it's not standardized.
you can only compare treadwear rating with the same manufacturer.
the rating is done by the manufacturere of the tires not DOT or other organizations. Thus the rating of 200 on a kumho is different then a rating of 200 on a dunlop.
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10-23-2002, 09:01 AM
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The Federal Government Uniform Tire Quality Grading (UTQG) standards apply to passenger car tires only (but excludes deep tread, winter-type snow tires, temporary use spare tires, and tires with nominal rim diameters of twelve inches or less). Tires subject to the standards are required to be graded by the tire manufacturer on treadwear, traction, and temperature.
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and a half times as well on the government course as a tire graded 100...if driven only on the particular test course. It's just a guideline for the most part. In addition the numbers can only be used to compare tires of the same brand.
The traction grades, from highest to lowest, are AA, A, B, and C. These grades represent the tire's ability to stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. The traction grade assigned to each tire is based solely on straight-ahead braking traction tests. It doesn't factor in acceleration, cornering, resistance to hydroplaning, or peak traction characteristics.
The temperature grades are A, B, and C, representing the tire's resistance to generating heat and its ability to dissipate heat. It is tested under controlled conditions on a specified indoor laboratory test wheel.
So basically stamped into the sidewall of the tire you'll see somethin like "UTQG 200 AA A" which means a treadwear rating of 200, traction rating of AA and temperature rating of A.
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and a half times as well on the government course as a tire graded 100...if driven only on the particular test course. It's just a guideline for the most part. In addition the numbers can only be used to compare tires of the same brand.
The traction grades, from highest to lowest, are AA, A, B, and C. These grades represent the tire's ability to stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. The traction grade assigned to each tire is based solely on straight-ahead braking traction tests. It doesn't factor in acceleration, cornering, resistance to hydroplaning, or peak traction characteristics.
The temperature grades are A, B, and C, representing the tire's resistance to generating heat and its ability to dissipate heat. It is tested under controlled conditions on a specified indoor laboratory test wheel.
So basically stamped into the sidewall of the tire you'll see somethin like "UTQG 200 AA A" which means a treadwear rating of 200, traction rating of AA and temperature rating of A.