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For many people, all-terrain tires are perfectly acceptable for everyday driving. But if you plan to drive somewhere with icy or snowy terrain, you'll probably need a set of winter tires. Check ...
The tow truck is equipped with an on-board water supply system that sprays water in front of the test tire. The brakes, from the test tire only, are momentarily locked, and sensors on the axle measure the longitudinal and vertical forces as it slides in a straight line. The coefficient of friction for the pair, test tire and surface, is then ...
Mountain snowflake pictograph: Winter passenger and light truck tires that meet the severe snow service requirements of Rubber Manufacturers Association (RMA) and Rubber Association of Canada (RAC). [25] N-x: Original tires for Porsche where "x" is a "0" for the first approved in that size, "1" the second, ... [25] "NHS": Not highway service
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.
[21] [22] As of 2016, snow tires were 3.6% of the US market and 35% of the Canadian market. [23] US states and Canadian provinces control the use of snow tires. [24] Of these, Quebec is the only jurisdiction that requires snow tires throughout. [25] Some may require snow tires or chains only in specified areas during the winter. [26] [27] [28]
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