It is an adjustment faster or slower from the original speed. Adjusted Speedometer Reading is what speed the car will need to go if using the after market tires, to be traveling at the same speed if the car had the original tires on. Tires button in the top calculator or Compare Metric Tires in the lower calculator to have the selected tire sizes compared. Enter your tire code in the Original Tire Size box, and your proposed new tire size in the New Tire Size box, then hit Compare. After the data entry of the required information, click on the Compare U.S. Converting a metric tire to inches can be done with the equation below, however, the above calculator is much easier 315 / 75 R 16 (Tire Width x Aspect Ratio x 2) / 2550 + Wheel Diameter x Tire Width / 25.4 - Wheel Diameter 35 x 12. The 195 is the tire width in millimeters, measured from the bottom of the bead to the bottom of the bead, the 70 is the sidewall aspect ratio, the ratio of sidewall height to tire width at the tread (indicating that the sidewall height is 70% of the tread width), and the 15 is the wheel rim diameter in inches. The following is an example to help to decode a tire size like 195/70R15. The tire tread width, sidewall (aspect) ratio, and wheel rim diameter from each of the two tires to be compared, along with a speedometer reading used to compute the effect the after market tire size has on your speedometer's accuracy. The information in the Required area is needed to perform the comparison. Calculations are to be treated as approximate only, due to possible and probable variations in how tires are manufactured. All calculations are designed to round up. designation tires and one for metric TRX designation tires. Compare information of original equipment tire size and alternate after market tire sizes. These calculators require the use of Javascript enabled and capable browsers. Note: Dimensions displayed are calculated using industry-standard tire sizing specifications: ISO. U.S And Metric Tire Size Information Calculator Using Tire Designations: ISO Metric, LT High Flotation.
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