When it comes to how to read tyre size, the first five digits of the code are the ones to concentrate on. The first three digits belong together and indicate the width of the tyre (in millimetres). In the example above, the tyre is 195mm wide. The two digits following the first slash are what is known as the aspect ratio.. Tyre sizes are made up of a number of different numbers and letters. For example tyre size 185/60 R 14 82 H is made up of the following information: 185. The tyre section width in millimetres. 60. The aspect ratio in % (the height of the sidewall divided by the tyre's width) R. Denotes the tyre's construction type - in this case it's a radial.

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It's the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width. In this example, the aspect ratio is 65, meaning the sidewall is 65 percent as high as the tire is wide. To get the sidewall height, take the tire width of 215 mm and convert it to inches (8.46). Then multiply this by 65% (.65).. Never replace your tires with ones that have a lower load index than the original tires. You always want to have tires with the same, or higher load index. So, if you had tires with a load index of 92 to start off, you want tires with at least an index of 92 or higher. 7. Find the tire's speed rating.