Since 1st February 2021 UK vehicle Regulations do not permit the use of tyres over 10 years old on the front steered axle(s) of heavy goods vehicles, buses and coaches. The DOT code is also useful in identifying tires subject to product recall or at end of life due to age. Department of Transportation but is used worldwide. The DOT code is an alphanumeric character sequence molded into the sidewall of the tire and allows the identification of the tire and its age. Main article: Tire § Regulation DOT code National technical standards regulations However, some pickup trucks and SUVs use the Light Truck Numeric or Light Truck High Flotation system. Most tires sizes are given using the ISO metric sizing system. New automotive tires frequently have ratings for traction, treadwear, and temperature resistance, all collectively known as the Uniform Tire Quality Grading. The code has grown in complexity over the years, as is evident from the mix of SI and USC units, and ad-hoc extensions to lettering and numbering schemes. Sometimes the inner sidewall contains information not included on the outer sidewall, and vice versa. This code specifies the dimensions of the tire, and some of its key limitations, such as load-bearing ability, and maximum speed. Alphanumeric code specifying tire sizes and limitsĪssorted new car tires with a variety of tread patterns and different sizesĪutomotive tires are described by an alphanumeric tire code (in North American English) or tyre code (in Commonwealth English), which is generally molded into the sidewall of the tire.
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