![]() Once you’ve calibrated your speedometer, make sure to recheck it periodically – especially if you change tires again – to ensure that it continues to give accurate readings. This means that 60 would now be considered “0” on your new scale and all other readings would be adjusted accordingly. To do this, simply multiply your current calibration reading by the ratio of your actual speed to the reading on your speedometer.įor example, if you were actually going 60 mph but your speedometer said 50 mph, then you would multiply 50 by (60/50), which equals 60. If you’re off by more than a few mph, then you’ll need to adjust your speedometer accordingly. Next, use a GPS device or phone app to measure your actual speed. This is your current calibration reading. Once you’ve reached this speed, note the reading on your speedometer. Start from a stop and then accelerate to your usual driving speed. This can be done by following a few simple steps.įirst, find a flat, level stretch of road where you can drive uninterrupted for at least a mile. If you have bigger tires on your car, you may need to calibrate your speedometer so that it accurately reflects your new driving speed. Lower your truck back down and reinstall the tireĬredit: Can You Calibrate a Speedometer After Bigger Tires?.Install the new speedometer gear, being sure to line it up correctly with the driven gear, and replace the cover.Take note of how it is positioned in relation to the driven gear before removing it so you can install the new one in the same way.With a small screwdriver, pry out the old speedometer gear.Find the speedometer gear housing on the differential and remove the cover.The good news is, there’s an easy fix for this problem- all you need is a GPS unit and a little bit of time. If you’ve added bigger tires to your F150, then you know that the speedometer is now reading inaccurately. How to Calibrate Speedometer for Bigger Tires F150
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