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 ...

If you've ever performed any kind of driveline or wheel and tire swap, you're probably familiar with speedometer calibration. By stepping up to larger tires and/or wheels, the speedometer reads slow ...

If it were up to us, we wouldn’t even have a speedometer in a Jeep. You don’t need a speedometer off-road and many of our Jeeps feature a self-limited top speed that will keep us out of the sights of ...