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Learn about tire pressure, load limits, tire letter rating, tire speed ratings, tire size, tire tread, tire rotation, maintaining proper tire pressure, tire balance & wheel alignment, tread wear grade and numbers, tire temperature grade, U.S DOT Tire identification numbers as well as other useful tire information at the U.S Department  of  Transportation National Highway Traffic Safety Administration website. Their website is very informative and provides a complete overview on tire safety.   Click here to visit their site and become more informed about tires and tire safety.