Computers & GPS
Browse used bike computers and GPS units for sale from riders across the UK. The category runs from small data-only head units to full mapping computers with 12 to 20 hours of battery, almost all of them fitting a quarter-turn out-front bracket and pairing with sensors over ANT+ and Bluetooth. For riders who want navigation on the bars, or a proper record of every ride.
Do I need mapping or just ride data?
A data-only unit shows speed, distance, heart rate and power and uploads the file afterwards, which covers most training and commuting for a fraction of the money. A mapping unit carries routable maps on board and re-routes you when you go wrong, which is what makes it worth the difference for touring, audax and unfamiliar gravel. Breadcrumb navigation sits between the two: it draws the line of your route but cannot name the road.
Bike computer or smart watch?
A 2.6 to 3.5in screen on the bars is readable at speed and lasts a long day without charging, and a head unit will hold more sensors at once with proper data fields for intervals. A watch records everything you do off the bike as well. If you want one device for all of it, look at smart watches; if you want the best display for riding, buy the computer.
What should I check on a used bike computer?
Charge it fully and ask what runtime the seller genuinely gets, because tired cells in older Garmin Edge and Wahoo Elemnt units are the most common reason they get sold on. Inspect the charge port for corrosion and its rubber cover for splits, press every corner of a touchscreen, and examine the plastic quarter-turn tabs on the back for cracks or rounding — a worn quarter-turn is how a head unit ends up under a car. Confirm it has been unpaired and reset, and ask which mount and cable are included.
Which sensors will it pair with?
Any reasonably modern head unit reads ANT+ speed, cadence and heart rate, and most take Bluetooth sensors too, so a used computer will work happily with a strap from heart rate monitors or a crank from power metres whatever the brand. Older units may not handle newer additions such as ANT+ gear shifting or radar, so ask specifically if you own either.
What is a fair price for a used bike computer?
A mapping unit one or two generations old typically sells at about half its original price, and a basic data unit well under a hundred pounds. Pay towards the top of that when the mount, cable and a battery still doing most of its rated hours all come with it. Buy new when map coverage or battery life matters more than the saving, since neither can be put right on a tired unit.