Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. For example, if your speedometer says 35 miles per hour on 20-inch diameter tires, changing to 23-inch diameter tires will make your true speed 40.25 mph, even though your speedometer will still show 35 mph.Know More
The difference in the speed shown by the speedometer and the true speed of the vehicle is due to the change in the distance traveled through each rotation of the tire. A tire with a 20-inch diameter has a circumference of 62.8 inches and will cover 62.8 inches in one rotation. A tire with a 23-inch diameter has a circumference of 72.2 inches and will cover 72.2 inches in one rotation.
Car manufacturers calibrate the speedometer to take into account the specific circumference of the tire on the car when it is originally built. When changing to a bigger tire, the speedometer will still be calibrated for the smaller circumference and will continue to account for the shorter distance covered by each rotation. For this reason, whenever you replace your tires with a size that is different from the original factory installed tires (either bigger or smaller) the speedometer should always be re-calibrated by a qualified mechanic.Learn more about Car Parts & Maintenance
There are several common causes for a speedometer to stop working. Typically, these malfunctions are caused by an issue with a car's wiring, a broken gear in the speedometer system, a speed sensor issue or a faulty engine control unit (ECU).Full Answer >
The speedometer of a vehicle determines speed based on the revolutions of the factory sized wheels and, as such, mounting larger tires will affect its accuracy. Fortunately, there are online conversion tools that help determine what speed a vehicle is traveling with larger mounted tires.Full Answer >
It is easy to sell tires and rims online through a dealership or as a private party. It is also an accepted practice to sell tires and rims to tire dealerships, auto body shops and repair outlets. Selling tires and rims requires that these pieces of vehicular infrastructure are in good shape and in demand due to the size, make and model of the tire and rim.Full Answer >
A vehicle's speed sensor is a monitoring device that measures the output of a transmission or transaxle in terms of wheel speed. This information is used by the engine control module to adjust the automobile's performance automatically in order to achieve optimum levels.Full Answer >