So a 285/75R16 metric tire would calculate to an inch measurement tire of 32.82X11.22R16. Therefore the sidewall twice would be 8.41 x 2 = 16.82 plus the wheel "16" makes the tire height 16.82 + 16 = 32.82. In example "B" the last number "16" is the wheel size the tire will fit on. To then get the overall diameter of the tire you would add the two sidewalls measurements and the diameter of the wheel. In this example the side wall height of the tire would be 75% of 11.22" which is 8.41" or 214mm. The next number represents the percentage of the width (285mm or 11.22") that is the sidewall height of the tire. To convert 285mm to inches you divide 285 by 25.4 to get 11.22". On metric tires the first number is your width of the tire in millimeters. This letter is the speed rating of the tire and indicates the maximum speed the tire can sustain. The speed rating of this tire size is V - 149 mph. A higher number means the tire can carry more weight. This number is the load index and the maximum amount of weight the tire can carry. The load index of this tire is 102 - 1874 lbs. The tire is designed to be mounted on an 17" wheel diameter. The wheel diameter of this tire size is 17 inches. Radial is the standard construction method for almost all tires. This letter is for how the tire is constructed. The tire construction of this tire size is R for radial. The second number in a metric tire size is called the aspect ratio and means that the sidewall height is 60% of the section width. The aspect ratio on this tire size is 60. The first number in a metric tire size is the section width of the tire. The width of this tire size is 255mm wide. An 'LT' would be a light truck class and no letter would be a euro-metric tire. The first letter in the tire size designates the tire class. Tire tire class of this tire size is 'P' which means it is a passenger car tire.
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