The ammeter is an electronic meter which records the speed of the rider.
Riders can record their speed, or the distance they traveled, using this device, and can record the speed with the help of a computer.
The speed of a rider is recorded by measuring the time of the bike’s rotation around the axis of the handlebars.
Motorcycle racers have the ability to record speed using this method, which is called the amperometer.
Motorcycle racer Tim Kayser, pictured in a photo from 2015, is using the ampere meter to record the time he’s ridden since joining the Harley-Davidson team.
This article was originally published by Buzzfeed.