Calculating the width of the autochthonous Accoutrement (OE) tires on a vehicle provides a approach to choose latest wheels and tires of the right proportions.4. Locate the OE wheel diameter; this is the last number in the tire size. In the example, 275/70R18, "18" represents the wheel diameter, in inches, that the tire is intended to be mounted on.
1. Set the OE tire proportions. This is form on the sidewall of the tire and Testament peep companion to "275/70R18."
2. Message the broadness of the tire from the early figure in the tire bigness. In this contingency, "275" represents the diameter across the tire, in millimeters, from the widest point.
3. Calculate the tires sidewall height.
In the example tire size, 275/70R18, "70" represents the height of the tire's sidewall, from rim to tread, as a percentage of the the tire width. In this case, the tire's height would be 192.5 millimeters or 7.58 inches. This is also known as the tire's series.
Ensuring you carry a Correct amount is fundamental to your safety and for a prerrogative celerity reading. When installing recent wheels and/or tires, most professionals propose career within a three percent, decided or bad, variance of the OE.
Instructions
Reading Tire Size's
Calculating Tire Diameter
5. Calculate the overall tire height, in inches, using the following formula ((Width/25.4)xSidewall Percentage)x2
A 275/70R18 tire would have an overall tire height of 15.16 inches, ((275/25.4)x70%)x2).
6. Combine the overall tire height with the wheel diameter.
Using the example of 275/70R18, you would add 15.16 to 18 for a final diameter of 33.16 inches.
7. Using the three percent variance rule, you would be able to install a new tire and wheel combination that was between 32.16 inches to 34.16 inches in total diameter.
