Tire Radius Calculator

…of different tire diameters resulting from tires worn to different tread depths, we'll compare two 225/45R17-sized tires, a new tire with its original tread depth of 10/32-inch and a second tire worn to 8/32-inch of remaining tread depth. The new 225/45R17-sized tire has a calculated diameter of…

…the tire tread and sidewall bend and stretch (deflect) when the load of the vehicle presses the tire against the road. Since the resulting 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…

…comparing tires within a single size. Tire Rolling Resistance Coefficient does not allow comparing different sized tires. As noted earlier, larger tires generate higher Rolling Resistance Forces than smaller tires. However the larger tire's greater overall diameter, circumference and rolling radius…