
Did you know that there is no single speedometer that is 100 percent accurate? As a matter of fact, most automotive manufacturers create speedometers that fall in between a pretty narrow tolerance range, no more than 1 percent to 5 percent too fast or too slow. The thing is, providing that a car is maintained at factory specs, its speedometer should keep on registering car speed within this range. However, if a vehicle is altered or modified in some way, it may affect the speedometer and call for a speedometer recalibration to reverse the problem.
One of the most performed car repairs—switching out the tires—is a very common, if not the most common way for a car owner to alter the speedometer accuracy in their vehicle. This is because switching out the tires for larger ones leaves the vehicle with more ground to cover in one complete revolution. Think about this following scenario.
Your brand new car that you purchased came with factory installed tires that each measured 21.8 inches in diameter, leaving a circumference of each tire to be 68.5 inches. If you decide to replace those stock tires with new ones, you may end up purchasing tires that are 24.6 inches in diameter. The new circumference would be 77.3 inches per tire. From that, it is evident that your vehicle will travel about 10 inches farther every time a revolution is completed. This, as a result, will tremendously affect your speedometer because it will now signify a vehicle speed that is too slow by almost 13 percent! If you see the number 60 as your speed limit, this will be deceiving you, as you’ll actually be driving 67.7 miles per hour!
What this comes down to is that you’ll definitely want to get a speedometer calibration for larger tires immediately upon purchasing them. After all, you do not want to get pulled over and receive a ticket when you thought you were traveling at the appropriate speed all along! A quality speedometer recalibration repair shop is Safety Restore. Safety Restore not only guarantees quality speedometer recalibration, but great prices, fast turnaround, and lifetime warranty as well!








