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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.
In Finland it is mandatory to have "winter" tires during Dec-Feb, but it is not regulated that any warning sign for lower speed rating tires is needed. —Preceding unsigned comment added by 80.81.162.66 ( talk ) 06:43, 30 October 2009 (UTC) [ reply ]
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.
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Titan Tire Corporation [79] USA: 1993 Goodyear (farm tires), Titan, Continental (OTR only) [80] Tigar Tyres Serbia: 1959 Tigar: Tomket Tires [81] [non-primary source needed] Czech Republic: 1997 Tomket (Czech brand of low category is made in China) Toyo Tire & Rubber [82] Japan: 1945 Nitto, Silverstone, Toyo: Trayal Corporation Serbia: 1955 ...