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Speed ratings with parentheses such as (W) and (Y) have maximum speeds set by the manufacturers. The load rating is often included within the parentheses, e.g. (86Y). Prior to 1991, tire speed ratings were shown inside the tire size, before the "R" construction type.
The wet grip index (WGI) is calculated from the results of two tests specified in the regulations. The first test measures the maximum achievable average deceleration of a vehicle as it slows from 85 ± 2 km/h (52.8 mph) to 20 ± 2 km/h (12.4 mph). The second test (the "skid trailer" test) is usually performed using a tow vehicle and trailer.
Dedicated winter tires, also known as snow tires, are not required to have a UTQG rating. [5] Non-passenger car tires, such as those for motorcycles, buses, medium trucks and above along with trailers are also not required to have a UTQG rating, although FMVSS Standard 109 requires the following to be listed on the tire's sidewall: speed ...
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This page was last edited on 30 November 2013, at 17:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 3.0; additional terms may apply.
Hoosier Racing Tire [39] USA: 1957 Hoosier: Hutchinson SNC [40] France: 1957 Hutchinson Tires Inoue Rubber [41] Japan: 1926 IRC Tires Kelani Tyres Sri Lanka: 1990 CEAT [42] Kenda Rubber [43] Taiwan: 1962 Kenda, Kenda radial Kumho Tires [44] [45] South Korea: 1960 Admiral, Marshal, Kumho, Zetum, Trailfinder [46] Madras Rubber Factory [47] India ...
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