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Your screen width is too small to display the calculator. Rotate your device to portrait mode or visit this page on a bigger screen. Original Tire Diameter:
Speedometer Converter. Ever wonder how far off your speedometer is with your new bigger tires? This uses a simple ratio calculation, so the info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assuming nothing but tire size has changed).
OEM Tire Diameter (inches) Speedometer Reading (mph) Calculate. A tire size speed calculator is a digital tool or formula that helps vehicle owners, mechanics, and enthusiasts understand how changes in tire size affect a vehicle’s speedometer accuracy and its actual speed.
Our speedometer calibration calculator will get you the answer you are looking for. Enter your original tire size, your new tire size, and then play with the miles per hour to see how much faster you are going at different speeds.
Changing to a different tyre size and wondering how much it'll affect your speedometer? Use this calculator to work out how much adjustment is necessary. Enter the old and new tyre sizes below for comparison:
Vintage Tire Conversion. When selecting a modern tire size for a classic car, it is important to compare the outside diameter and tread footprint of the original tires against potential replacements.
Enter the old and new tire size to calculate the speedometer error with the new tire.
