Cycle computers without GPS are the cheapest and simplest form of this technology on the market.
What does it do?
Most cyclocomputers will have basic but useful functions including current speed, total ride time, average speed, maximum speed, ride distance and total distance. Some will have a clock or even the ability to compare the current and average speed. More expensive ones will be able to measure your cadence or heart rate.
How much does one cost?
You can get a cycle computer with very basic functionality for under £10. If you want extra features like a cadence or heart rate monitor, you’ll have to up your budget to the £30 – £70 mark.
How does it work?
The computer will come with a magnet and a sensor: the magnet attaches to a wheel spoke which will rotate past a sensor that you fix to the front fork. You then input your wheel size and the computer does the maths for you to discover how far you’ve gone and at what speed.
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If the computer also features a cadence sensor, you’ll need to attach a magnet to your crank arm and a sensor to your chain stay (like this).
Garmin also do a combined cadence and speed sensor, in which case the spoke magnet goes on the rear wheel.
Some will monitor heart rate too – HR sensors are usually mounted on an elastic band so you can wrap it around your chest.
Do I want a wired or wireless model?
Well, that depends. Wired models will transmit the signal from the sensor to your display unit with no chance of interference. They often require some work to get the cables looking neat and tucked safely away from any moving parts. They also tend to be cheaper.
Wireless models are much more convenient and tidier, but those of you who need to know their time with supreme accuracy may prefer a wired model. Wireless computers are excellent, but it’s always less likely that there will be any interference or discrepancies with a wired option. Wireless computers also tend to be a touch heavier.
Why would I get one instead of a GPS computer?
Computers that use sensors tend to be cheaper than their GPS counterparts, and will usually have a longer battery life.
What are the main brands?
Cateye, Topeak, VDO, Knog and Ciclosport.
What else do I need to consider?
Do you want a battery indicator?
How complex do you want your computer to be? Consider whether the interaction design will be off-putting or difficult to use when you are on the bike, possibly wearing gloves, in the freezing cold.
Does it need to have a backlight for early morning or late night rides?
