[OCInsomniac]

Anyone find any info on the YG 91's? Must be fairly new 'cause Tire Rack.com doesn't have any reviews on them yet. Was wondering what others thought of them, how good they are in ice, snow & wet road surfaces, and about how long we can expect them to last. :?:

OC

 

[inlets]

Don't expect them to last too long OC. The tread wear on the sidewall is only 28. Which basically equates to 28,000 miles before you'll need to replace them, and that's under the optimum of conditions.

 

[flyingn]

I think you mean 280.

 

[inlets]

flyingn on the sidewall it states treadwear 28, which is I believe X by 1,000 or 28,000 miles. On my BMW shows 36 on the Michlins.

 

[inlets]

correct flyingn 280 is the number, calculation was correct though.

 

[karrock]

Not sure I'd be so hard and fast with that 280 UTQG rating = 28k mileage...

The G91A's they're selling at Tire Rack have a 60k mile treadlife, 5-year workmanship & materials warranty...

 

[inlets]

I see that from your link Tony. On paper they seem to look pretty good. Why do yo think the manufacturer only places 280 on the side wall then? I'd be a lot happier if I saw 600.

 

[sstarrx3]

The G91s are built specifically to be an OEM tire. Says so right on Yokohama's web site.

 

[karrock]

I see that from your link Tony. On paper they seem to look pretty good. Why do yo think the manufacturer only places 280 on the side wall then? I'd be a lot happier if I saw 600.

I'm thinking that because the wear rating is realtive to the "Course Monitoring Tire", it wouldn't be the same every time the test is performed. That, and the number is "extrapolated" from 7,200 miles of tested tire wear. I'd suspect some manufacturers embellish, and others are more cautious, for sake of liability.

From Tire Rack:

Treadwear Grades

UTQG Treadwear Grades are based on actual road use in which the test tire is run in a vehicle convoy along with standardized Course Monitoring Tires. The vehicle repeatedly runs a prescribed 400-mile test loop in West Texas for a total of 7,200 miles. The vehicle can have its alignment set, air pressure checked and tires rotated every 800 miles. The test tire's and the Monitoring Tire's wear are measured during and at the conclusion of the test. The tire manufacturers then assign a Treadwear Grade based on the observed wear rates. The Course Monitoring Tire is assigned a grade and the test tire receives a grade indicating its relative treadwear. A grade of 100 would indicate that the tire tread would last as long as the test tire, 200 would indicate the tread would last twice as long, 300 would indicate three times as long, etc.

The problem with UTQG Treadwear Grades is that they are open to some interpretation on the part of the tire manufacturer because they are assigned after the tire has only experienced a little treadwear as it runs the 7,200 miles. This means that the tire manufacturers need to extrapolate their raw wear data when they are assigning Treadwear Grades, and that their grades can to some extent reflect how conservative or optimistic their marketing department is. Typically, comparing the Treadwear Grades of tire lines within a single brand is somewhat helpful, while attempting to compare the grades between different brands is not as helpful.