A Cyclocomputer is basically a digital speedometer with some other useful features added on. Using a cyclocomputer is a good way to keep track of the time and distanced ridden. Basic models will have a few essential features such as speed, distance, odometer and the time. Top models can have other functions such as Heart Rate, Power Output, GPS functions and some can even be downloaded into a personal computer to track all the data. Cyclocomputers are really fairly simple. A magnet is mounted to a spoke and a sensor is mounted to a fork blade or chainstay. When the magnet passes the sensor the sensor sends a signal to the computer head. The computer head measures the amount of time between signals and uses a set wheel size calibration number to compute the speed of the wheel. This is why it takes at least 2 revolutions of the wheel before a cyclocomputer can display and accurate speed.
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