Actual Speed Calculator (MPH)
Enter your original and new tire sizes into the table below and select a base speed to calculate your speedometer's offset and your vehicles actual speed.
Corrected Speed Calculation Basics
Your vehicle's speedometer reading is based on the diameter of the original tires so when you install larger (or smaller) tires, your speedometer reading will no longer be accurate. Additionally, the greater the difference in tires size and the faster you drive, the more inaccurate your speedometer will be. Ideally, you should install new ring and pinion gears (see out gear ratio calculator) or an engine programmer to adjust for the new tires, however, until then, you can calculate your estimated speed by dividing your new tire diameter by the OEM tire diameter and multiplying that by your vehicle speed.
Actual Speeds For Popular Tire Changes
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This actual speed calculator is ©Copyright Crawlpedia.com - Please provide a link back to this page when copying.
Data is accurate to the best of our knowledge and is offered as-is with no guarantee.
More Gear and Axle Guides:
Differential Locker Comparison - A detailed comparison of popular differentials and lockers.
Gear Ratio Finder - Find the ideal axle gear ratio for your new larger or smaller tires.
Gear Ratio Calculator - Calculate the gear ratio of gears based on their tooth count.
Ring and Pinion Setup Specs - Ring and pinion gear setup specifications for popular axles.
Ring and Pinion Ratio Variations - An explanation of why some ring and pinion gear ratios vary.
Thick Gears and Carrier Breaks - Thick ring and pinion gears and differential carrier breaks explained.
