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Sidewall separation The parting of the rubber compound from the cord material in the sidewall. Speed rating (letter code) A standardized letter code indicating the maximum speed at which a tire is designed to be driven for The speed rating letter code, where applicable, is molded on the tire sidewall ⇒ page 190. You may not find this information on all tires because it is not required by law. Tire Pressure Monitoring System A system that detects when at least one of a vehicle's tires is underinflated and illuminates a low tire- Tread The portion of a tire that normally touches the road. Tread rib A tread section running circumferentially around a tire. Tread separation Tire failure caused by the tread pulling away from the tire carcass. Tread wear indicators (TWI) Raised areas within the main tread grooves that show, visually, when tires are worn and near the end Uniform Tire Quality Grading (UTQG) A tire information system developed by the U.S. National Highway Traffic Safety Administration U.S. DOT Tire Identification Number (TIN) A tire's serial number. It begins with the letters “DOT” (“Department of Transportation”) and indicates For example, the numbers 1709 mean that the tire was produced in the 17th week of 2009. Any other Vehicle capacity weight The total rated cargo, luggage and passenger load. Passenger load is 150 lbs (68 kilograms) times the Vehicle maximum load on the tire The load on an individual tire that is determined by taking each axle's share of the maximum loaded Vehicle normal load on the tire The load on an individual tire that is determined by taking each axle's share of the curb weight, acces- |