# Speedometer Correction Calculator

Calculate Tacoma speedometer error from a tire size change. See your true speed, the percent error, and whether the change is within the safe window.

## Canonical URL
https://tacotires.com/speedometer-correction-calculator

## What It Does
- True speed: Shows actual speed for any indicated speed, since a taller tire travels farther per revolution.
- Percent error: Reports the speedometer error and flags whether it is inside the roughly 3 percent safe window.
- Gearing note: Explains that a regear does not change speedometer error; only tire diameter does.

## Summary
- Calculates true speed and speedometer error from a change in tire diameter.
- Larger tires make actual speed higher than the speedometer reads; smaller tires do the opposite.
- Notes that regearing does not fix speedometer error because the speed sensor reads at the wheel hub.

## FAQ
### Do bigger tires make the speedometer read high or low?
Bigger tires make the speedometer read low. The truck travels farther per wheel revolution than the factory calibration assumes, so your actual speed is higher than the number shown.

### How much speedometer error is too much?
Within about 3 percent is considered excellent and usually not worth correcting. Beyond about 5 percent is where most owners recalibrate for accuracy and to keep the odometer honest.

### Does regearing fix speedometer error?
No. The Tacoma speed sensor reads at the wheel hub, so tire diameter causes the error and axle gears do not change it. Recalibrate with a tuner or dealer tool instead.

## Related Tools
- [Tire size calculator](https://tacotires.com/tire-calculator)
- [Gear ratio calculator](https://tacotires.com/gear-ratio-calculator)

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