Repeat the test three or four times to be sure, and average the resulting times. If your average time is off by 3 seconds or more, your speedometer is likely in need of re-calibration. If you have changed out the tire and wheel package, the OD and resulting change in revolutions per mile is likely the cause.
Call Toll Free: Exclusive Member Savings. Please try again or click the Checkout button! How a Change in Tire Size Affects Speedometer Accuracy When you change out your tires and wheels for a larger wheel, you always want to respect the overall diameter OD of the original tire.
Click to Call Toll Free. Tires-Easy has been supplying quality, new tires online to United States consumers since We pride ourselves on having the best selection of quality new tires with top name brands. Useful Links. Sign Up For Savings. Look for the drive gear that is mounted inside the transmission. Count the number of teeth on the drive gear and take note of it.
Multiply the revolutions per mile by the number of teeth you counted in the drive gear. Then, after that, look for the axle ratio in the documents of your car. Multiply the axle ratio with the number you came up with after multiplying the revolutions per mile with the teeth.
Divide that number with 1, This will give you the number of teeth you need in the new drive gear. Purchase a new drive gear with the number of teeth you calculated and replace the one in the speedometer.
Put everything back the way it was. Press and hold the calibration button on your speedometer. Start the vehicle and then release the button. Press the button a third time after traveling the prescribed test drive distance. This will recalibrate the speedometer to fit the new tire size. This can also affect your odometer and speedometer as larger tires will have a larger circumference, causing you to travel a little bit further per each complete tire rotation.
As a result, your speedometer will show you moving SLOWER than you actually are, and can lead to unwanted speeding tickets. This also will cause your odometer to register fewer miles than you are actually traveling. Is deciding the best way to increase your tire size causing a headache? Call your local AAMCO for help on how to figure out how to best calibrate your speedometer when increasing your tire or wheel size.
The increased size causes the tires to rotate slower to cover the same amount of ground. If you are running an automotive transmission this can cause some serious strain depending on the current gear ratio if you choose not to re-gear your system. If you are considering increasing your tire size and want to do it yourself, check out this incredibly handy tire size calculator for figuring out what sizes might be appropriate for your vehicle.
Or if figuring all the ins and outs of changing your tire or wheel size sounds too complicated then let the experts at your locally owned AAMCO Colorado handle it! Schedule your Appointment online today.
While the impact on certain systems can be minor, the potential wear is increased significantly if you are changing size for a 4x4 vehicle. If you are planning to go off-roading then we recommend doing thorough research into upgrading many of those components to handle the increased traction given by your bigger tire. As a result, your gas mileage can be affected as well. Need help deciding the best way to increase your tire or rim size without causing potential damage to your vehicle?
Schedule an appointment with your local AAMCO Colorado today to get the right advice you need to ensure your car is in it for the long haul. Or feel free to ask an AAMCO mechanic online and get some free advice for any of your automotive repair or customization needs.
Summer heat is no joke this year. Aside from scheduling an The last thing you want when you hop in your car is to find yourself stuck.
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