Tire Rating System
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Tire Rating System
At first I was impressed with the specs on my Khumo Excta ASX 255/45/17ZR. They had a 400 tread and AA ratings.
When I went through them in 4 months I wondered why the hell they lasted less time than my stocks.
After researching I learned thet there is no unversal tire rating system! Tires are only ranked against their own line.
So a Michelin 300 Tread Rating and a Khumo 300 Tread Rating have nothing to do with each other. Everything is ranked up to a number 100 (highest possible points on grading scale) ONLY within its own line.
No wonder my friends Michelins with worse specs girp/last/ride so much better
Sorry if this is old info but news to me!
When I went through them in 4 months I wondered why the hell they lasted less time than my stocks.
After researching I learned thet there is no unversal tire rating system! Tires are only ranked against their own line.
So a Michelin 300 Tread Rating and a Khumo 300 Tread Rating have nothing to do with each other. Everything is ranked up to a number 100 (highest possible points on grading scale) ONLY within its own line.
No wonder my friends Michelins with worse specs girp/last/ride so much better
Sorry if this is old info but news to me!
Last edited by EnthuZiast; Sep 25, 2004 at 01:12 PM.
Re: Tire Rating System
Originally posted by EnthuZiast
After researching I learned thet there is no unversal tire rating system! Tires are only ranked against their own line.
So a Michelin 300 Tread Rating and a Khumo 300 Tread Rating have nothing to do with each other. Everything is ranked up to a number 100 (highest possible points on grading scale) ONLY within its own line.
After researching I learned thet there is no unversal tire rating system! Tires are only ranked against their own line.
So a Michelin 300 Tread Rating and a Khumo 300 Tread Rating have nothing to do with each other. Everything is ranked up to a number 100 (highest possible points on grading scale) ONLY within its own line.
The treadwear is a measure of that manufacturers particular tire against a government "standard tire". Your 300 rating means that the tire should last 3x longer than the gov. std. which is assigned a rating of 100.
From the Yokohama site for example:
Uniform Tire Quality Grade (UTQG) Labeling
Required by the government, the UTQG provides comparative manufacturer information. Tires are subjected to a series of government-mandated tests that measure performance in treadwear, traction and temperature resistance. All testing is done by the tire manufacturer.
Treadwear
Treadwear is a measurement of tread durability. Tested against an industry standard, the assigned numerical grade indicates how well the tread lasts compared with a reference standard of 100. A treadwear rating 200 means the tread wears twice as well as the standard. Actual wear depends on the conditions under which the tire is used. Driving habits, service practices, differences in road surface and varying climates all affect treadwear.
The number would be meaningless with comparison to some standard. Now, a tire manufacturer can claim that a tire is a 30,000 mi or 60,000 mi tire but that is not the treadwear rating.
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From: Washington
DiscountTireDirect seems to indicate that the tread wear rating should only be used to compare within a manufacturer rather than across manufacturers.
http://www.discounttiredirect.com/di...oTreadwear.jsp
Uniform Tire Quality Grading System
The US Government has established the UTQGS, the Uniform Tire Quality Grading System, to assist consumers in their purchase of tires. Basically it's another tool to be used besides the opinions you gather from trusted friends, mechanics and whatever other sources you may have at your disposal. The key to using this system is to understand that it is a relative comparison system. The UTQGS is not a safety rating and not a guarantee that a tire will last for a prescribed number of miles. Under UTQGS, tires are graded by manufacturers in three areas: treadwear, traction and temperature. The information is right where you need it when buying the tire 1.) on the paper label affixed to the tread and 2.) on the tire molded into the sidewall.
Treadwear
The treadwear grade is a comparative rating based on the wear of a tire when tested carefully under controlled conditions. For example, a tire graded 400 should have its useful tread last twice as long as a tire graded 200. Another tire manufacturer, however, may grade a comparable design 300, so a grade of 150 would last half as long under their grading scheme. The lesson learned is to not use one manufacturer's grade versus the other, but instead to compare tire grades within a given brand. Actual treadwear performance can vary tremendously according to the tire's real-world use: variations in driving habits, service practices (most importantly air pressure maintenance) and road conditions and climate affect tire life.
http://www.discounttiredirect.com/di...oTreadwear.jsp
Uniform Tire Quality Grading System
The US Government has established the UTQGS, the Uniform Tire Quality Grading System, to assist consumers in their purchase of tires. Basically it's another tool to be used besides the opinions you gather from trusted friends, mechanics and whatever other sources you may have at your disposal. The key to using this system is to understand that it is a relative comparison system. The UTQGS is not a safety rating and not a guarantee that a tire will last for a prescribed number of miles. Under UTQGS, tires are graded by manufacturers in three areas: treadwear, traction and temperature. The information is right where you need it when buying the tire 1.) on the paper label affixed to the tread and 2.) on the tire molded into the sidewall.
Treadwear
The treadwear grade is a comparative rating based on the wear of a tire when tested carefully under controlled conditions. For example, a tire graded 400 should have its useful tread last twice as long as a tire graded 200. Another tire manufacturer, however, may grade a comparable design 300, so a grade of 150 would last half as long under their grading scheme. The lesson learned is to not use one manufacturer's grade versus the other, but instead to compare tire grades within a given brand. Actual treadwear performance can vary tremendously according to the tire's real-world use: variations in driving habits, service practices (most importantly air pressure maintenance) and road conditions and climate affect tire life.
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Guess whose back, back again...
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From: AZ
Im not sure about the systems.....but I do know for sure that all different brands do not compare against the same standard!
Khumo sucked compared to a lesser rated Michelin
Khumo sucked compared to a lesser rated Michelin
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From: phoenix, arizona
An acquaintance (sp?) of mine is a tire engineer for a major tire company. SCCA Solo2 has a minimum treadwear rating of 140 for its street tire classes. I was explaining this to him and he said "That's odd, tread wear ratings are specific to a manufacturer. Bridgestone's 200 rating isn't necessarily going to be the same as Dunlop's 200, and so on." I've asked a few other people and heard the same thing.
In some cases it's almost a made up number. The Pirelli P-Zero Corsa (some weird Italian name) uses a treadwear rating of ~60 on some sizes, and a treadwear rating of 140 on just a few. That was pretty much the hot tire in Solo2 for a while till the SCCA caught on and banned it. I doubt Pirelli changed the treadwear ratings for just a few sizes (of the same model tire) just so people could autocross on it, but it's clear they had some intention of cheating.
http://tinyurl.com/5ryzp
In some cases it's almost a made up number. The Pirelli P-Zero Corsa (some weird Italian name) uses a treadwear rating of ~60 on some sizes, and a treadwear rating of 140 on just a few. That was pretty much the hot tire in Solo2 for a while till the SCCA caught on and banned it. I doubt Pirelli changed the treadwear ratings for just a few sizes (of the same model tire) just so people could autocross on it, but it's clear they had some intention of cheating.
http://tinyurl.com/5ryzp
Last edited by phoenixZ33; Sep 28, 2004 at 03:06 PM.
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