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Prior to 1991, tire speed ratings were shown inside the tire size, before the "R" construction type. The available codes were SR (180 km/h, 112 mph), HR (210 km/h, 130 mph), VR (in excess of 210 km/h, 130 mph). Tires with a speed rating higher than 300 km/h (186 mph) are indicated by a Y in parentheses.
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. The UTQG was created by the National Highway Traffic Safety Administration in ...
They are differentiated by speed rating for different vehicles, including (starting from the lowest speed to the highest): winter tires, light truck tires, entry-level car tires, sedans and vans, sport sedans, and high-performance cars. [26] Apart from road tires, there are special categories: Snow tires are designed for use on snow and ice.
Results of at least three runs of each test are combined to produce the wet grip index, yielding ratings of A - G (although D and G are not used for passenger cars), where A is the best. When buying tyres, it is worth noting that the braking distance (in the wet) from the reference speed of 85 km/h, to a standstill, varies by something of the ...
The standard test speed for tire uniformity machines is 60 r/min of a standard load wheel that approximates 5 miles per hour. High speed uniformity machines are used in research and development environments that reach 250 km/h and higher. High speed uniformity machines have also been introduced for production testing.
Here is a list of Consumer Report's tires that achieved their best rolling resistance rating. The tires at the top of the list are rated higher overall. Highly rated: All Season Michelin X Radial; Michelin Agility Touring; Michelin Harmony; Toyo 800 Ultra; Sumitomo HTR T4; Middle rank Performance All Season Michelin Energy MXV4 Plus
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