Another question would also be what’s the difference between wheel speed and vehicle speed?
In: 620
Some mechanical or electronic bit in the car “knows” how big the wheels are suppossed to be. Based on how long it takes the wheel to make one full revolution the math is fairly straightforward to turn that into how fast the car is driving.
If you spin the wheels on the car on a slick surface where the car doesn’t actually move the speedometer will still tick up based on the speed of the wheels. The system assumes the car is actually moving rather than just peeling out.
Also, if you change the tires on your car and put a drastically different size on it can cause your speedometer to read incorrectly unless you get it recalibrate to compensate. This can be a common problem for the people who put the giant tires on their lifted truck. The bigger the tires are the slower its going to read and then you get pulled over for speeding even though your gauge doesn’t say you are.
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