In rare cases, a D will identify a bias ply construction, where the body plies crisscross on a diagonal. ![]() The higher the aspect ratio, the taller the tire sidewall.Ī letter R following the tire aspect ratio identifies the tire's construction as a radial tire. In the example below, the aspect ratio of the tire is 70 percent, so the section height of tire will be 129.5mm. Aspect ratio is simply identified as a percentage of the section height divided by the section width. The two-digit number following the section width identifies the tire’s aspect ratio. The actual tire may not match perfectly to this, but it is close. The three-digit number identifies the tire’s section width in millimeters. 195/70R15C is an example of this type of sizing convention. C signified the tire is a commercial tread, intended for vans or delivery trucks that are capable of carrying heavy loads. This kind of tire is designed to be used temporarily, only until a flat tire can be repaired or replaced.Ī Euro-metric size designed for carrying heavy cargo and/or towing trailers often ends with the letter C. Those sizes are known as flotation light truck size. An example of this type of sizing convention is an 35x12.50R17LT.Ī tire size that begins with a letter T signifies the tire is a temporary spare or mini-spare. In older size conventions, the LT designation may be at the end of tire size. LT signifies the tire is a light truck-metric size that was designed to be used on pickup trucks, which have higher cargo carrying and towing capabilities than passenger cars.Īn example of this type of sizing convention is an LT215/75R15. Light truck tires that are designed based on the TRA’s standard often start with two letters: LT. Euro-metric sizes are dimensionally equivalent to P-metric sizes, but typically differ subtly in load-carrying capabilities. These sizes are known as hard-metric or Euro-metric size tires. ![]() Passenger tires that are designed based on the European Tyre and Rim Technical Organization’s (ETRTO) standard start without any letters. Passenger tires that are designed based on the Tire and Rim Association’s (TRA) standard start with the letter P and are known as P-metric size tires. The typical letter for passenger and light truck tires would be P, LT, T and C. Some tire size designations start with a letter(s) that identify the type of vehicle and/or type of service for which they were designed.
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