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Sidewall Markings
Sidewall Markings
Tire size is the most important information given on the tire. The size designation is specified as a series of numbers and letters, for example, 185/65 R 14 86 T, where:
| 185 | is the width of the tire in mm |
| 65 | is the aspect ratio (height to width ratio) |
| R | denotes radial construction |
| 14 | is the rim diameter in inches |
| 86 | is the load index |
| T | is the speed rating. |
The speed rating shows the maximum continuous driving speed capability of the tire. The speed rating to be selected depends on the make and model of your car. The use of tires with speed ratings that are too low can affect the driving performance and tires with speed ratings that are too high may reduce driving comfort.
The most important speed ratings are:
Q = 99 mp/h / 160 km/h
R = 106 mp/h / 170 km/h
S = 112 mp/h / 180 km/h
T = 118 mp/h / 190 km/h
H = 130 mp/h / 210 km/h
V = 149 mp/h / 240 km/h
W = 168 mp/h / 270 km/h
Y = 186 mp/h / 300 km/h
