If the R in the size was replaced with a D ( 215/55R17 94V), it would identify that the internal tire body plies crisscross on a diagonal and that the tire has a "bias ply" construction. Radial tires are by far the most popular type of tire today representing over 98% of all tires sold. The R in the 215/55R17 94V size identifies that the tire has a radial construction in which the tire's plies "radiate" out from the center of the wheel. By converting the 215mm to inches (215 / 25.4 = 8.46") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.23". We know that this tire size's section width is 215mm and that its section height is 50% of 215mm. The lower the number, the lower the sidewall. The higher the number, the taller the sidewall. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The 55 indicates that this tire size's sidewall height (from rim to tread) is 50% of its width. Typically, following the three digits identifying the tire's width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio. 55 means that the height is equal to 55% of the tire's width. The ratio of the height of the tire's cross-section to it's width. Because many people think of measurements in inches, the 215mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch). The 215 indicates that this tire is 215 millimeters across from the widest point when mounted and measured on a specified width wheel. The use of p-metric sizes began in the late 1970s and they are the most frequently used type of tire size today.įollowing the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's section width/cross section in millimeters. This includes cars, minivans, sport utility vehicles and light duty pickup trucks (typically 1/4- and 1/2-ton load capacity). When a tire size begins with a P, it signifies the tire is a p-metric size that was designed to be fitted on vehicles that are primarily used as passenger vehicles.
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