How to Adjust Speedometer for Bigger Tires F150? A Guide

If you have recently installed bigger tires on your F150, then you will need to adjust the speedometer accordingly. This is a relatively easy process that can be done in just a few minutes.

  • Find the circumference of your new tires
  • You can do this by wrapping a measuring tape around the tire at the widest point or by looking up the specs online
  • Divide the circumference of the new tires by the circumference of the old tires
  • This will give you your ratio
  • Multiply your speedometer reading by your ratio to find your true speed
  • For example, if you’re going 60 MPH with a 2
  • 5:1 ratio, you’re actually going 150 MPH

Forscan Ford F150 Speedometer Calibration Due To Larger Tires Size

How to Adjust Speedometer for Bigger Tires Ram 1500?

If you have a Ram 1500 and you’re looking to adjust your speedometer for bigger tires, there are a few things you need to know. First, the size of your tires will affect how much your speedometer is off by. The larger the tire, the greater the difference in speed will be.

Second, you’ll need to know what size tires you have so that you can properly adjust your speedometer. And finally, there are a few different ways to adjust your speedometer for bigger tires; we’ll go over those now. To start, let’s talk about how big a different tire size makes on your speedometer reading.

If you have a 33″ tire and your speedometer reads 60 mph, it’s actually only going 56 mph. But if you have a 40″ tire and your speedometer reads 60 mph, then you’re actually going 64 mph. So as you can see, the bigger the tire, the greater the discrepancy between what your speedometer says and your actual speeds. Now that we know how much difference tire size makes, let’s talk about how to properly adjust your speedometer for bigger tires.

To do this accurately, you first need to know what size tires you have. Once you know that information, there are two main ways to make the adjustment: either re-calibrate your vehicle’s computer or install an aftermarket GPS device that will automatically adjust speeds for different-sized tires (we’ll get into more detail on both of these methods below). Re-Calibrating Your Vehicle’s Computer: This method requires getting under the hood and connecting two wires together for about 20 minutes while driving at various speeds; full instructions can be found here.

After completing this process, your vehicle’s computer will be “re-set” and should properly reflect speeds with the new tire size. Installing an Aftermarket GPS Device: This method is simpler than re-calibrating your vehicle’s computer because it doesn’t require any work under the hood -you just plug it in and set it up according to instructions. One popular model is the Trailblazer GPS Speedo Corrector; however, there are many other models available depending on the make/model/year of the vehicle.

These devices typically run between $100-$200 but may be worth investigating if adjusting-computerized settings aren’t possible or desirable.

Hypertech Speedometer Calibrator

If you’re looking for a way to make your car’s speedometer more accurate, the Hypertech Speedometer Calibrator is a great option. This device can be used to calibrate both new and old cars, and it’s easy to use. Simply plug it into your car’s OBD-II port, select the correct vehicle settings, and then drive around until the calibration is complete.

The whole process takes less than an hour, and once it’s done, you’ll have a speedometer that is much more accurate.

2021 F150 Speedometer Calibration

The 2021 F150 Speedometer Calibration is a process that allows you to ensure your speedometer is reading accurately. This can be done by either visiting your local Ford dealership or by following the instructions in your owner’s manual. Either way, it is important to make sure your speedometer is calibrated correctly so you can drive safely and avoid getting speeding tickets.

Forscan Speedometer Calibration F150

If you’re looking to calibrate your speedometer on your Ford F150, Forscan is the way to go. This software is designed specifically for Ford vehicles, and it’s pretty easy to use. First, you’ll need to download Forscan and install it on your computer.

Then, connect your computer to your vehicle’s OBD-II port using a Forscan-compatible adapter. Once you’re connected, open Forscan and select the “Body” tab. Scroll down to the “Speedometer/Odometer” section and click on the “Calibrate” button.

From there, you can enter the new calibration value that you want to use. Make sure to save your changes before exiting Forscan. That’s all there is to it!

With Forscan, calibrating your speedometer is a breeze.

How to Adjust Speedometer for Bigger Tires F150


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! There are a few different ways that you can go about doing this, depending on the make and model of your vehicle. First, consult your vehicle’s owner’s manual to see if there are any specific instructions on how to do this.

If not, there are a few general methods you can try. One way to adjust your speedometer for bigger tires is to simply recalibrate it based on the new tire size. To do this, you will need to know the circumference of your new tires.

You can either measure this yourself or look up the specs online. Once you have this information, divide it by pi (3.14) to get the diameter of your tire in inches. This number should be entered into the appropriate menu on your speedometer console.

Another way to adjust your speedometer for bigger tires is to install a GPS-based device that will automatically make the adjustment for you. These devices are typically aftermarket products that plug into your vehicle’s OBD-II port (usually located under the dash). Once installed, they use GPS data to determine your actual speed and then display that information on your speedometer.

This is a very convenient solution if you don’t want to deal with manually recalibrating your speedo every time you change tire sizes. Of course, one downside of these GPS-based devices is that they can be somewhat expensive (typically around $100 or so). But if accuracy and convenience are important to you, they may be worth the investment.

How Much Does It Cost to Recalibrate Speedometer?

How much does it cost to recalibrate the speedometer? If your speedometer is reading inaccurately, you may need to have it recalibrated. The cost of this service will vary depending on the make and model of your vehicle, as well as the shop you take it to.

However, you can expect to pay somewhere in the range of $50-$100 for a professional calibration.

How Do You Calculate Speed With Bigger Tires?

If you’re looking to up the ante on your speed, one way to do it is by increasing the size of your tires. But how does this affect your speed? Let’s take a look at how to calculate speed with bigger tires.

When you increase the diameter of your tires, you are effectively increasing their circumference as well. This means that for each revolution of the wheel, your tire will cover more ground. And since distance = rate x time, if all other things are equal, a bigger tire will help you cover more ground in less time, thus increasing your speed.

Of course, there are other factors that come into play when calculating speed, such as wind resistance and terrain. But all things being equal, bigger tires = higher top speed. So if you’re looking to go fast, make sure those rubber discs are big!

Can I Put Bigger Tires on My F150?

If you own a Ford F-150, you may be wondering if you can put bigger tires on your truck. The answer is yes, but there are a few things to keep in mind before doing so. First, bigger tires will affect your gas mileage.

Larger tires require more power to rotate, which means your engine has to work harder and use more fuel. You can offset this somewhat by choosing tires with a lower rolling resistance rating, but it’s still something to be aware of. Second, bigger tires can throw off your speedometer and odometer readings.

This is because the circumference of the tire is larger, so it will travel further per revolution than a smaller tire. As a result, your speedometer will read higher speeds than you’re actually going, and your odometer will rack up mileage faster than usual. Again, there are ways to compensate for this (like recalibrating your speedometer), but it’s something to keep in mind.

Finally, remember that installing larger tires may require some modifications to your truck. For example, you may need to install wider wheels or adjust your suspension components. And if you’re planning on putting really big tires on your truck (like 35 inches or larger), you’ll definitely need to make some changes, like installing a lift kit.

So just be prepared for some extra work (and expense) if you go down this route. Overall, putting bigger tires on your Ford F-150 is perfectly doable – just keep the potential downsides in mind before making any decisions.

Read Another Post: How to Adjust Speedometer for Bigger Tires? | Tips

How Much Do Bigger Tires Affect Speedometer?

Most people believe that bigger tires will result in a higher speedometer reading, but this is not always the case. The size of the tire has more to do with the circumference of the tire than the width. A wider tire will have a smaller circumference and therefore spin faster, resulting in a higher speedometer reading.

Conversely, a narrower tire will have a larger circumference and spin slower, resulting in a lower speedometer reading. So, while bigger tires may affect your speedometer readings, it really depends on the width of the tire.


If you have bigger tires on your F150, you’ll need to adjust your speedometer accordingly. Here’s how:

1. Park your truck on level ground and set the emergency brake.

2. Find the Odometer/Trip Odometer button on your dash and press it until Trip Odometer A is displayed.

3. Note the number of miles that are currently showing on the trip odometer. This is your current mileage reading.

4. Use a calculator to divide your current mileage by 120 (this is the number of inches in a foot). For example, if your current mileage reading is 24,000 miles, then 24,000 divided by 120 equals 200 feet. This will be your new base measurement for determining the distance traveled.

5. Press the reset button on the trip odometer and then drive 1 mile at a constant speed (preferably between 25-35 mph). When you’ve traveled 1 mile, note the new reading on the trip odometer display B. In our example above, let’s say this new reading is 202 feet. which means that our truck has traveled two extra feet for every 1 mile we’ve driven!

So now we know that our truck’s speedometer needs to be adjusted by 2%. 6a) If you have an older model truck with an analog speedometer gauge, simply twist the small knob located at either 4 o’clock or 8 o’clock (depending on which side of the gauge cluster your speedo sits on) until the needle points to 2% faster than what it was previously pointing to. So if our truck’s needle was pointing at 55 mph before we made our adjustments, it should now be pointing at 56 mph after making our changes.

All done!

David V. Williamson

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