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What Does Each Number And Letter Mean On A Tire?
Home » Car Maintenance » Choosing The Right Tires For Your Car » What Does Each Number And Letter Mean On A Tire?Reading from left to right on the tire, P stands for passenger car (LT stands for light truck; the next 3 numbers is the measurement in millimeters of how wide the tire tread is; the next 2 numbers is the aspect ratio (the width of the tire tread divided by the sidewall height; R stands for radial construction; and the last 2 digits is the diameter of the wheel in inches.
Car and minivans typically come from the factory equipped with passenger car tires, while pickup trucks, SUVs and full size vans come with light truck tires.
Speed ratings tell how fast a tire is rated to perform safely at recommended air pressures. You will find a letter to describe the tire's speed rating. Most manufacturers put the rating just before the letter R. A speed rating of S means it is safe for operation at speeds up to 112 mph.
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