How Do You Know If Your Speedometer Is Correct – 2024 Guide

A speedometer is one of the interesting things inside your car that is more meaningful than you could think. Many people believe this tool shows the speed of traveling from one place to another. However, this is not quite correct. The way speedometer function is a bit different than that – it measures the rotation of the wheel, axel, and driveshaft.

After gaining these pieces of information, basic math is used to determine the rotation precisely, it determines how quickly your vehicle is actually going. If you are a bike driver, then you will easily figure out that the speedometer on both vehicles functions almost identical.

Yet, there is one common problem that you need to be aware of. In case when the diameter of the wheel alters, the speedometer will never manage to precisely determine your speed. For instance, sooner or later you will have to put new tires on your vehicle, right? Well, in that case, the diameter will go up. The same rule counts in cases when you boost the tire pressure.

So, what happens if the diameter decreases? First of all, this happens when you have less air in your tires or when you put those tires that do not have the same dimension. In that case, the revolution of the wheels will reduce as well and you will go slower.

Fortunately for you, there are multiple companies such as where you can repair your speedometer in case it does not work properly. The bad news is that most people do not even notice that their speedometer is not working properly. Because of that, we would like to teach you how to know if your speedometer is correct or not. The pieces of advice below will surely simplify the entire process. Let’s go!

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You Need to Calculate Your Speed


The best way to check out whether your speedometer is correct or not is to try to calculate the actual speed of your vehicle. You should invite someone to join you and go together with you on a highway. However, not every highway is going to be good. You should find those that have mile markers.

After you find the highway of that type, start driving and ask your friend to turn on a clock. Determine the precise distance you want to pass and check out how much time you need to do that. Our recommendation is to determine five miles, but you can decide on a longer distance if that seems like a good idea to you.

Now, when you end your “mini-trip”, you need to check out two different things. The first thing you need to say is the results of the speedometer. After you do that, check out the calculations that you and your friend made. You have to divide the travel time into 60 equal parts (that refer to minutes) and multiple them with the number of miles that you passed on the highway.

Let’s use an example to make things clear. Let’s say that you passed 10 miles for 10 minutes and 30 seconds. That would mean you should use the formula 60/10.5 x 10. The result you get is the actual speed of your vehicle.

Anyway, compare this result with the one that you see on the speedometer. It is completely okay if the difference is only a few meters per hour. However, if the difference is a lot bigger than that, then you seriously need to start thinking about repairing the speedometer. Of course, there is one DIY option that you can try out. You can, in case your vehicle is modern, press a certain button to calibrate the speedometer. After you do that, repeat the same process and check out whether the difference is the same or not. If it remains the same, that means you will have to find professional assistance.

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Reasons Why You Speedometer Does Not Work


After explaining how you can calculate on your own whether your speedometer is correct or not, we would like to move to another topic. There are certain common reasons why you may have to deal with this sort of situation. If you notice that the speedometer is not working at all, then there is a big chance you will have to repair the speedometer head. Despite that, the Check Engine Light can appear after the speedometer stops working properly. In most cases, the speed sensors are responsible for this scenario because they do not send the information at all. That only means you will need to buy new speed cables that are usually relatively cheap. At least, most people will manage to afford new ones without any reason to sacrifice their overall budget.

Bonus Tip: How to Find Appropriate Professional Speedometer Repair Service?


The best possible thing for you would be if you can fix this problem alone. However, decide on this move only if you are experienced with vehicle repairs. If not, do not hesitate to hire a professional because you can cause bigger and more expensive damage. The good news is that these services do not have to be extremely expensive.

However, money is not the factor you should follow. If you try to save it on solving this issue, then you may find a bad repair service and get an inaccurate speedometer quicker than you would ever want.

Anyway, finding a professional company is not as difficult as you might think. All you have to do is to check out how experienced workers within the company are experienced with this sort of duty. If they are working for years in this industry, that means they have the necessary knowledge and skills to help you.

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On the other hand, you will have to make an additional step and check out the reviews of their previous clients. In most cases, you may find the reviews online or directly on the website of the company. If you see most of them are relatively good, then there is nothing you should worry about. Reviews serve as some sort of social proof that gives you an additional confirmation.