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Tire size calculator5/7/2023 Generally, it is recommended to not exceed a 3% difference when changing from the OEM size on a non-modified vehicle.Ī green row means that the alternate tire diameter matches the calculated tire diameter. This will only occur when there are both versions on the tire available, otherwise the one range is for all tires.įor instance, if it says +2.5% then that alternate size is 2.5% taller than the calculated tire size. In some cases you will see an (extra) text that is showing the rim range for the Light Truck version of the alternate size. The wheel column is showing you the wheel diameter of the alternate tire size along with a range of wheel widths that the alternate tire size is approved to be mounted on. The width column is showing you the alternate tire size width in inches. The diameter column is showing you the alternate tire size diameter in inches, along with the percentage difference from the calculated size. When you make a tire calculation it will populate a list of alternate sizes with a tire size, Diameter, Width, and Wheel column. This makes the tire shorter and therefore spins more times than an unloaded tire and makes calculating the specific revs per mile difficult.Īs a general rule revs per mile will be 3% more than the unloaded calculation.įor example if a tire is calculated to have 100 revolutions per mile under no load, then the tire will spin closer to 103 times per mile when under load. Generally the width will change about 2/10" for every 1/2" in rim width when mounted within the tire's rim range.Īctual revs per mile are physically measured with the tire under load. The tire width will change slightly when mounted on a different rim width. Most tires on our site will provide a 'Measured Rim' spec, this is the width of the rim that the tire was mounted on when taking the spec measurements. Keep in mind, tire specs are measured with the tire mounted on the measured rim width and not installed under the weight of a vehicle. In most cases the calculated dimensions will be very close, but this is why we provide a list of tires that are manufactured in each size.Īfter calculating, you can select individual tires to check the actual manufacturer specs for that tire. Tires from each manufacturer have small variances in diameter and width from one another. When using our tire calculators to get tire size dimensions and revolutions per mile, the results are mathematic calculations based on if every tire was made to the exact same specifications.Īs you may know this is not the case.
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