
Have you recently changed your tire size or final-drive gear? Regardless of whether you switched to larger tires or smaller tires, you likely have made your speedometer and odometer inaccurate as a result. Of course, driving with an inaccurate odometer and speedometer can not only be annoying, but dangerous too. Below, I will describe how you can perform a speedometer recalibration for different size tires and fix both the odometer and speedometer.
Fortunately, if you own a modern car with a digital speed sensor, there is a relatively easy way to solve your problems. The following steps should work on any vehicle equipped with an electronic speedometer. Sadly, if you own a 1967 Camaro with a gauge driven by a cable stemming from the transmission, this repair process will not work for you.
For the repair process, you’ll need to purchase a speedometer recalibration device. To repair your inaccurately reading speedometer, you will also have to perform some real-world testing. This way, you can determine the percentage of error induced by the substitution of your new tires or gearing. To do this, you will need a GPS-connected device to verify speed. Anything from a phone app, portable navigation system, or a device like a VBox should work.
After you have obtained a percentage, plug the calibration device into the speed sensor, which may be attached to the transmission. You should follow the posted instructions to program in the correct amount of compensation. The great thing is that this repair will also recalibrate your car’s odometer, because both the speedometer and odometer use the same sensor. You’ll have to be a little handy to make this repair process work, but the end result will be worth it. After all, you don’t want to get pulled over for speeding if you thought that you were driving the speed limit all along! Plus, this process is much easier than the old way of tinkering with speedometer gears and just hoping for the best.
If you’re wondering where to get speedometer calibrated, if you do not trust yourself doing it, or just don’t want to put in the effort, the answer is Safety Restore. Safety Restore specializes in quality and affordable speedometer recalibration.

