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These represent the tire's resistance to the generation of heat at speed. Tires graded A effectively dissipate heat up to a maximum speed that is greater than 115 mph. B rates at a maximum between 100 mph and 115 mph. C rates at a maximum of between 85 mph to 100 mph. Tires that cannot grade up to C or higher cannot be sold in the US. [9]
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.
The Australasian New Car Assessment Program (ANCAP) is a car safety performance assessment programme based in Australia and founded in 1993. ANCAP specialises in the crash testing of automobiles sold in Australia and the publishing of these results for the benefit of consumers. ANCAP provides consumers with transparent advice and information on ...
Some manufacturers will install a speed governor if a vehicle is ordered with tires rated below the vehicle's maximum speed. In some parts of the European Union, e.g. Germany, it is allowed to mount tires with a lower speed rating code if the car manufacturer specifies tires with a very high speed rating in the registration documents and the ...
The first standardized, 35 mph front crash test was May 21, 1979, and the first results were released October 15 that year. The agency established a frontal impact test protocol based on Federal Motor Vehicle Safety Standard 208 (“Occupant Crash Protection”), except that the frontal 4 NCAP test is conducted at 56 km/h (35 mph), rather than ...
If the tire is not checked, it has the potential to cause vibration in the suspension of the vehicle on which it is mounted. In tire retail shops, tire/wheel assemblies are checked on a spin-balancer, which determines the amount and angle of unbalance. Balance weights are then fitted to the outer and inner flanges of the wheel. [2]
A wheelspin occurs when the force delivered to the tire tread exceeds that of available tread-to-surface friction and one or more tires lose traction.This leads the wheels to "spin" and causes the driver to lose control over the tires that no longer have grip on the road surface.