4x4 Speedometer Error Calculator
After upgrading to larger tires, your speedometer will no longer display your true speed. Because larger tires travel further in one revolution, your vehicle is actually moving faster than the gauge indicates. Use this precise calculator to find your actual speed and avoid unexpected speeding tickets.
Speedometer Correction Tool
Why is my speedometer wrong?
Your vehicle calculates speed by counting the rotations of the output shaft. When you increase the tire diameter, the distance covered per rotation increases. Without recalibrating the vehicle's computer, the speedometer will "under-read" your true velocity.
Disclaimer: This calculation is based on theoretical tire diameters. Factors like tire wear, air pressure, and manufacturer variations can affect actual speed. Use this tool as a general guide and always drive safely.