How do bigger tires affect my speedometer

Each new tire has a circumference of This has a tremendous affect on your speedometer, which will now indicate a speed that is too slow by almost 13 percent. Press the button again and drive the distance prescribed by the speedometer manufacturer.

Press the button a third time after you have driven the designated distance. After pressing the button the third and final time, the speedometer will recalibrate itself to fit the new tire size. The circumference of the new 33 inch tire is Things to Remember When Getting a Lift Kit Installed: The taller height of the tires will throw off speedometer readings and can change the transmission shift points governed by the engine control computer.

A larger diameter means that the wheel will be heavier and consequently speed will be slightly compromised during acceleration depending also on the torque of the car ; Bigger wheels will also increase the maximum load of the car. So, increasing your wheel size will decrease the driving force from your wheels which will culminate in a decrease in acceleration of said wheels. How do smaller tires affect the odometer? Do large tires affect the speedometer? Use this calculator to approximately determine whether or not you have correctly recalibrated your speedometer: Mechanical Speedometer Open the hood and locate the transmission.

Unscrew the speedometer cable from the transmission and then remove the plate to expose the two gears that drive the speedometer. 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. 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. Aspect Ratio Ratio - Ex.