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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 ...
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 ...
[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]
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.
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
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