How to Calibrate Speedometer for Larger Tires Ford

If you own a Ford and have larger tires, you may need to calibrate your speedometer. This process is simple and only takes a few minutes.

  • Park the Ford on a level surface and set the parking brake
  • Place a jack under the front of the vehicle and raise it until the tires are just clear of the ground
  • Locate the speedometer cable at the back of the transmission
  • The cable has a large metal housing with two small wires coming out of it, one black and one white
  • Unscrew the retaining nut on top of the speedometer cable housing with a wrench and pull the cable off
  • Wrap electrical tape around any exposed wire to prevent shorts, then unscrew and remove the old speedometer gear from inside the housing using needle-nose pliers
  • Find your new speedometer gear by matching it to your old one or by consulting a chart in an auto parts store or online that lists gears by tire size (see Resources)
  • If you’re unsure which gear to get, take your old one to an auto parts store so they can help you find a match
  • 7a Insert the new speedometer gear into position in inside Housing, then screw it in place clockwise with needle-nose pliers until snug
  • 7b Reattach Housing to Transmission unit
  • 8 Screw on Retaining Nut hand tight
  • 9 Lower Vehicle
  • 10 Check Speedo for Accurate Readings

Ford Speedometer Calibration Tool

If you’re looking for a way to calibrate your Ford speedometer, there’s no need to go to the dealer or mechanic – you can do it yourself with a simple tool. All you need is a Ford speedometer calibration tool, which is available online or at most auto parts stores. With this tool, you can easily and accurately calibrate your speedometer in just minutes.

Simply connect the calibration tool to your vehicle’s data port, enter in the new desired speed, and drive! The tool will take care of the rest, automatically adjusting your speedometer readings to match your new input. Not only is this method more convenient than taking your car to the dealership or mechanic, but it’s also much more affordable.

A Ford speedometer calibration tool typically costs less than $100, whereas having a professional do it can easily run into the hundreds (or even thousands) of dollars. Whether you’re looking to save money or time (or both), using a Ford speedometer calibration tool is the way to go!

How to Calibrate Speedometer for Larger Tires Ford


Can You Adjust Your Speedometer for Bigger Tires?

If you have ever wondered if you can adjust your speedometer for bigger tires, the answer is yes! Here is how to do it: First, find out the new circumference of your tire.

You can do this by measuring the height and width of your tire and then using this formula: C = π * (h + w). Next, use this formula to calculate the new distance traveled per revolution of your wheel: D = C/π. Now that you know the new D, divide it by the old D from when you had smaller tires.

This will give you a decimal number that you will need to multiply by 1,000. This will be your new speedometer reading factor. For example, if your new D is 31 inches and your old D was 26 inches, then your decimal number would be 1.1923.

To get your new speedometer reading factor, just multiply 1.1923 by 1,000 which equals 1,192.3 miles per hour (mph). So now every time your car goes one mile per hour (mph), your speedometer will read 1,192.3 mph!

How Do You Calibrate a Speedometer for Different Size Tires?

Most speedometers are calibrated for tires that are the standard size for the vehicle. However, if you have changed the size of your tires, you will need to calibrate your speedometer. This can be done with a simple mathematical formula.

First, determine the new diameter of your tires. You can do this by measuring the circumference of the tire and dividing by 3.14 (pi). Once you have the new diameter, divide this number by the old diameter.

This number is your “tire factor” which you will use in the next step. Next, multiply your current speed reading by the tire factor. This will give you your correct speed.

For example, if you are currently traveling at 50 mph and your tire factor is 1.2, your true speed is 60 mph. It is important to recalibrate your speedometer whenever you change tire sizes so that you can accurately gauge your speed and avoid getting speeding tickets!

How Do You Measure Speedometer With Bigger Tires?

If you have bigger tires on your car, you may be wondering how to accurately measure your speedometer. Here are a few tips: 1. Use a GPS speedometer app – This is probably the most accurate way to measure your speed with bigger tires.

There are many different apps available, so find one that suits your needs and preferences. 2. Use a tire size calculator – You can input the information about your car and tires into a tire size calculator and it will give you an estimated speed for your new setup. This isn’t as accurate as using a GPS app, but it’s still a good method to use.

3. Use a handheld GPS unit – If you have a handheld GPS unit, you can simply measure your speed as you’re driving along. Again, this isn’t as accurate as using an app, but it’s still a decent method to use if you don’t have access to one. 4. Ask someone else to measure your speed – If all else fails, ask someone else to measure your speed for you while you’re driving.

Just be sure that they’re paying attention and not speeding themselves!

How Do I Calibrate My 2012 F150 Speedometer?

If your 2012 F-150’s speedometer is inaccurate, you can calibrate it yourself in just a few minutes. All you need is a basic understanding of your truck and a few tools. First, park your truck on level ground and set the emergency brake.

Then, find the vehicle information sticker inside the driver’s doorjamb. This sticker will have the truck’s axle ratio and tire size listed. You’ll need this information to accurately calibrate the speedometer.

Next, open the hood and locate the speed sensor on the transmission. The sensor has two wires coming out of it – one black and one white. Using a multimeter, test the resistance between these two wires.

The resistance should be between 700-900 ohms at 68 degrees Fahrenheit (20 degrees Celsius). If the resistance is not within this range, you’ll need to adjust the sensor until it is. To do this, loosen the retaining nut on the back of the sensor with a wrench and turn the sensor clockwise or counterclockwise until you get within range.

Once you’re in range, retighten the retaining nut so that it’s snug but not too tight – about 20 ft.-lbs. of torque should do it. With the sensor adjusted, start up your truck and drive for about 10 miles so thatthe calibration can take effect.

Afterward, recheck your speedometer against another reference like a GPS unit or car with known accurate speedometer readings to see if it’s now reading correctly!

Forscan ford f150 speedometer calibration due to larger tires size


If you have recently installed larger tires on your Ford vehicle, you may need to calibrate your speedometer to ensure accuracy. Luckily, this is a relatively easy process that can be done in just a few minutes. First, find a flat and level stretch of road where you can drive uninterrupted for at least 1 mile.

Next, use a GPS app or speedometer to record your exact speed as you drive past a mile marker. Then, compare this speed to the reading on your Ford’s speedometer. If the two speeds are not identical, you will need to adjust your speedometer accordingly.

To do this, simply press and hold the trip odometer button until the display changes from “trip A” to “trip B.” Then release the button and press it again until the display reads “calibrate.” Finally, enter your actual speed into the display and press set/reset to save the new setting.

With these simple steps, you can ensure that your Ford’s speedometer is accurate regardless of which size tires you are using!

David V. Williamson

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