If you've ever modified a car with smaller or larger tires or, perhaps, a different final-drive gear, you've immediately screwed up your speedometer. This is, of course, annoying, but for modern cars ...

450,000 cars sold each year are victims of odometer fraud —taking a car odometer and rolling back the displayed mileage to increase the perceived value of the car. Odometer rollback is a federal ...

You can use speedometer apps on your Android smartphone to find out the speed of your car, bike, or other vehicle. Speedometer apps tell you the current speed, average speed, over-speed alerts, trip ...