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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]
Signed into law by President Bill Clinton on November 1, 2000 The Transportation Recall Enhancement, Accountability and Documentation or TREAD Act ( Pub. L. 106–414 (text) (PDF) ) is a United States federal law enacted in the fall of 2000.
Tires with a smooth tread (i.e., having no tread pattern) are known as slicks and are generally used for racing only, since they are quite dangerous if the road surface is wet. Street tires will also include wear limit indicators in the form of small raised bridges within the grooves.
In many prefectures, tread grooves of snow tires are worn off for more than 50% of their original depth, tires must be replaced to meet the legal requirements. [14] Drivers will be fined for failing to comply with the snow tire or tire chains requirements, and checkpoints are in place on major highways.
In a non-scientific study (I looked at tires available from a national chain that fit my car), 85 percent of LRR tires had an “A” rating for traction, compared to 87 percent of Non-LRR tires.
In the case of wear, a new "185/70R14" tire of 620 mm (24.4 inch) diameter will have ≈8 mm tread depth, at legal limit this reduces to 1.6 mm, the difference being 12.8 mm in diameter or 0.5 inches which is 2% in 620 mm (24.4 inches).
They have limits though; they turn down requests to install tires that compromise the safety of the vehicle. I missed the opportunity to have a conversation with him about the safety of everyone else.
1992 – a stricter tyre tread depth requirement for most vehicles; 1994 – a check of emissions for diesel engine vehicles; ... subject to legal maximum prices. The ...