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. After the data entry of the required information, click on the Compare U.S. Sizes with similar tire diameter: Section width less than 355 mm Ratio of section width over tire diameter between 0.25 and 0.52 Ratio of wheel diameter. 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. Parameters include width, circumference, aspect ratio, diameter, radius, wheel diameter, speed and sidewall height. The information in the Required area is needed to perform the comparison. Convert and compare different tire sizes. 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. (This number represents the tread width measured in millimeters.) Enter the ASPECT RATIO into. U.S And Metric Tire Size Information Calculator Using the P-Metric Style box, enter the WIDTH in the first box.
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