Like, how do they work? They’ve been around since nearly as long as cars have been around so it’s not some fancy modern engineering. How does it know what speed the cars going?
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**ABOUT TIRE DIAMETER**
For each 1/8 of an inch of tire wear, the speedometer will show you going about 1 MPH faster than you’re actually going. IF I did my math correctly.
Not a big deal unless you go from smaller-to-larger tires. E.g., 19″ to 20″ which could have you trying to explain math to a State Trooper about how you double the wear because it’s worn on both the top AND bottom so the circumference and so on and what not until he drags you out and starts clubbing you with his nightstick.
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