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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


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.


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).


The most likely reason a speedometer stops working is a broken gear. Finding the problem involves removing the speedometer assembly from the vehicle and locating the problem piece. Replacements are available at dealerships, auto parts stores and online.


The most common causes of speedometer problems are damaged rear facial gears and damaged engine speed sensors. Electrical problems within the speedometer itself also cause speedometer malfunctions. In other cases, a damaged gearbox cable is the root of the problem.


According to the SCS Gearbox website, there are three types of boat speedometers in common use: one that uses global satellite positioning, or GPS, to measure speed; one that uses water pressure and velocity; and one in which an impeller is employed to gauge speed. Of the three methods used to measu


Gear replacement for a speedometer requires jacking up the car, disconnecting the speedometer cable, removing the speedometer gear housing, replacing the gear, and reassembling. Park the vehicle on a flat surface, and put wheel chocks around one of the rear wheels before beginning the replacement.


The techniques for troubleshooting a speedometer vary according to the age of the vehicle. For example, cars built before 1990 made use of a cable, while newer cars use speed sensors that determine how fast the vehicle is traveling. Older vehicles may require the cable to be adjusted, while newer ve


The retail price of tires hinges on a variety of factors, including oil prices, the size of the particular tire and the size of the retailer. Typically, lower oil prices, smaller tires and larger retailers who are able to afford buying their inventory in bulk contribute to lower prices.


The calibration of a speedometer is based on the torque that the magnetic field creates and takes into account the ratios of the gears in the drive cable, the final drive ratio in the differential and the diameter of the tires. A large change in the size of a car's tires is one of the most common wa