Therefore the sidewall twice would be 8.41 x 2 = 16.82 plus the wheel '17' makes the tire height 16.82 + 17 = 33.82. In example 'B' the last number '17' is the wheel size the tire will fit on. To get the overall diameter or 'height' of the tire you would add the two sidewalls and the diameter of the wheel. In this example the side wall measurement of the tire would be 70% of 12' which is 8.41' or 214mm. The next number represents the percentage of the width (305mm or 12') that is the sidewall measurement of the tire. So your width of a 305mm tire is 12 inches. To convert 305mm to inches you divide 305mm by 25.4 to get 12'. On metric tires the first number is your width of the tire in millimeters. The final number simply is the wheel size or 'diameter'of the wheel that the tire will fit on.įinding the tire size meaning in metric measurements is a little more difficult and usually take a calculator to get exactly right. In example 'A' this reads 12.50, meaning the tire width is 12 and 1/2 inches. In most cases with inch measurement tires the width will have a. The second number represents the width of the tire. In this example the tire diameter or 'height' is 33 inches tall. The first number is your overall diameter of the tire.

To find the tire size meaning in inches is very straight forward.

There are two ways that tire manufacturers display tire size, inches and metric.

Origin 8 tires