Rolling Diameter Calculator

…225/45R17-sized tire has a calculated diameter of 24.97", a circumference of 78.44" and will roll 835 times each mile. The same tire worn to 8/32-inch of remaining tread depth is calculated to be 1/8" shorter with a diameter of 24.84", have a circumference of 78.04" and will roll 839 times per mile.…

…tire had a calculated diameter of 24.97", a circumference of 78.44" and rolled 835 times each mile. The same tire worn to 8/32-inch of remaining tread depth was calculated to be 1/8" shorter with a diameter of 24.84", had a circumference of 78.04" and rolled 839 times per…

…loaded or rolling radius is less than half the tire's published overall diameter (which would only reflect the tire's unloaded radius), calculating the tire's absolute rolling circumference isn't possible. Additionally, a tire transitions from an unloaded to loaded state as it rolls, continuously…

…Fuel Economy Tire Rolling Resistance Part 2: Defining Rolling Resistance Tire Rolling Resistance Part 3: Changes to Expect When Switching from Worn-Out to New Tires Tire Rotation Instructions Tire Safety Recalls Tire Size Conversion Chart Tire Size Guide Tire Sizes by Diameter Tire Specs Explained…

…if the assembly is "round" when rolling under load. The GSP9700 Vibration Control System can also measure lateral and radial rim runout (out of roundness or side-to-side movement) to identify and separate wheel runout from tire runout. The system then calculates the contributions of the wheel and…

…Fuel Economy Tire Rolling Resistance Part 2: Defining Rolling Resistance Tire Rolling Resistance Part 3: Changes to Expect When Switching from Worn-Out to New Tires Tire Rotation Instructions Tire Safety Recalls Tire Size Conversion Chart Tire Size Guide Tire Sizes by Diameter Tire Specs Explained…

…passenger capacity). Regardless of their calculated Rolling Resistance Coefficients, a large tire generating 30 pounds of Rolling Resistance Force will require more energy to roll than a small tire generating 15 pounds of Rolling Resistance Force. Tire rolling resistance has an impact on vehicle…

…if the assembly is "round" when rolling under load. The GSP9700 Vibration Control System can also measure lateral and radial rim runout (out of roundness or side-to-side movement) to identify and separate wheel runout from tire runout. The system then calculates the contributions of the wheel and…

…Fuel Economy Tire Rolling Resistance Part 2: Defining Rolling Resistance Tire Rolling Resistance Part 3: Changes to Expect When Switching from Worn-Out to New Tires Tire Rotation Instructions Tire Safety Recalls Tire Size Conversion Chart Tire Size Guide Tire Sizes by Diameter Tire Specs Explained…

…Fuel Economy Tire Rolling Resistance Part 2: Defining Rolling Resistance Tire Rolling Resistance Part 3: Changes to Expect When Switching from Worn-Out to New Tires Tire Rotation Instructions Tire Safety Recalls Tire Size Conversion Chart Tire Size Guide Tire Sizes by Diameter Tire Specs Explained…

…differences between the tires' published diameters, tread depths and tire revolutions per mile. However, if a tire rolls fewer times per mile than the tire it replaces, the vehicle will again actually be traveling farther than is indicated by the odometer. Calculating the influence of the different…

…Fuel Economy Tire Rolling Resistance Part 2: Defining Rolling Resistance Tire Rolling Resistance Part 3: Changes to Expect When Switching from Worn-Out to New Tires Tire Rotation Instructions Tire Safety Recalls Tire Size Conversion Chart Tire Size Guide Tire Sizes by Diameter Tire Specs Explained…

…to calculating tread depth percentages because the tire is already legally worn out with just 2/32" of remaining tread depth. Useable tread depth is calculated by subtracting 2/32" from the tires' new tread depth. Then usable tread depth is compared to remaining tread depth in order to calculate…