Speedometer Calibrator
See exactly how far off your speedometer is after bigger tires, and get the right fix.
Quick Answer: Going from 31\" to 35\" tires creates a 12.9% speedometer error, your speedo reads 70 mph when you're actually doing 79. This affects shift points, ABS, and odometer accuracy. A performance tuner ($300–$600) is the easiest fix.
HOW IT WORKS
Enter Tire Sizes
Input your stock and new tire diameters using sliders or exact sizes
See the Error
View speedometer error, actual speed at 70 mph, and annual odometer drift
Get the Fix
Compare tuner, calibrator, and dealer reflash options for your vehicle
Enter Your Tire Sizes
RELATED CONTENT
Speedometer Calibration Guide
In-depth guide covering tuners, calibrators, and dealer reflash options.
Re-Gearing 101
When and why you need new gears after bigger tires.
Tire Size & MPG Impact
How bigger tires affect fuel economy and what to expect.
33s, 35s, or 37s, Everything Changes
The real-world impact of upsizing tires on every system.