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 wi... More »

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 de... More »

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 de... More »

A car speedometer measures speed: how fast the car is moving. Speedometers measure speed in miles per hour or kilometers per hour. Some gauges display both readings. More »

According to Dictionary.com, a speedometer is an "instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled." Odometers date to as early as 1... More »

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... More »

As a general rule, putting a lift kit and bigger tires on a truck will decrease its gas mileage. There are, however, some ways to mitigate this. More »