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Tire identification labels. Automotive tires are described by several alphanumeric tire codes (in North American English) or tyre codes (in Commonwealth English), which are generally molded into the sidewall of the tire. These codes specify the dimensions of the tire and its key limitations, such as load-bearing ability and maximum speed.
ZR rated tires are mostly for top of the line high performance cars such as Corvettes, Vipers, Mustangs etc. Z meaning it is rated to handle speeds over 140+ mph with a very soft rubber compound for an automobile tire. — Preceding unsigned comment added by 174.138.196.67 05:45, 6 January 2013 (UTC)
UTQG ratings on sidewall of Toyo Tires Proxes R39 tire UTQG ratings (top) and tire code (bottom) on sidewall of Continental ContiProContact tire. Uniform Tire Quality Grading, commonly abbreviated as UTQG, is a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction.
For passenger and light truck tyres, the manufacturers or importers have the choice of either putting a sticker on the tyre tread or a label accompanying each delivery of batch of tyres to the dealer and to the end consumer. The tyre label will use a classification from the best (green category "A") to the worst performance (red category "G").
Tire uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers. These standards include the parameters of radial force variation , lateral force variation , conicity, ply steer, radial run-out , lateral run-out , and ...
WS6 was standard equipment on the Formula and GTA from 1987 to 1992, and optional on the Trans Am. WS6 from 1987 until 1992 included 36 mm front sway bars, 24 mm rear sway bars, quick-ratio steering box, gas-filled struts and 16-inch wheels with 245/50R16 tires. Later WS6 cars used ZR rated tires.