Cyclocomputer

Basic cyclocomputer showing speed and Odometer readings.
Wired reed switch sensor with spoke mounted magnet.

A cyclocomputer, cycle computer, cycling computer or cyclometer is a device mounted on a bicycle that calculates and displays trip information, similar to the instruments in the dashboard of a car. The computer with display, or head unit, usually is attached to a mount on the handlebars for easy viewing and hands-free navigation. Some GPS watches and smartphones can also be used as display. It can communicate with sensors, including speed sensors, cadence sensors, power meters, and heart rate monitors. Today, it is popular among cyclists to use a smartphone as a cycling computer. However smartphones are not purpose built to be used as cycling computers and have sensitive camera components that risks damage if it encounters prolonged or high amplitude vibrations beyond its design limits. Unlike smartphones, dedicated cycling computers are purpose built for cycling conditions, and have certain advantages, including longer battery life, improved screen visibility under direct sunlight, better sensor signal reliability, lighter weight, and greater resistance to weather and impacts.

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