Cycle computers have evolved dramatically over the past decade. What was once a basic speedometer is now a navigation device, training tool, and sensor hub — often with connectivity to your phone, heart rate monitor, and power meter. Here’s how to make sense of the options and choose what you actually need.
Basic Computers: Speed, Distance, Time
For casual riders who just want to know how fast they’re going and how far they’ve ridden, a simple wired or wireless computer does the job for £20–40. These typically show speed, distance, average speed, and elapsed time. They’re reliable, require no charging, and have no subscription fees.
GPS Computers: Navigate and Record
GPS-enabled computers add route navigation, track recording, and segment comparisons. The two dominant brands — Garmin and Wahoo — offer excellent options from around £150 upward. Key GPS features to consider:
- Turn-by-turn navigation: following a pre-loaded route with on-screen directions is invaluable for unfamiliar areas.
- Strava segments: many computers show live segment data and performance against previous efforts.
- Elevation and gradient: barometric altimeters give accurate climb data.
- Sensor connectivity: ANT+ and Bluetooth support for cadence sensors, heart rate monitors, and power meters.
Power Meters: Training by Numbers
For serious training, a power meter measures output in watts — a direct measure of effort unaffected by wind, hills, or fatigue. Paired with a GPS computer, you can train to precise intensity zones, track fitness improvements, and plan race pacing. Power meters range from £200 for spider-based or pedal-based units to over £600 for premium options.
Heart Rate Monitors
Chest strap heart rate monitors are highly accurate and pair with most modern cycle computers. Wrist-based optical sensors (as on many sports watches) are convenient but can be inaccurate during vigorous exercise. For training zone work, a chest strap is worth the minor inconvenience.
Radar and Safety Features
The Garmin Varia radar rear light detects approaching vehicles and alerts you via the head unit — a genuine safety upgrade for rural roads. Some computers also support incident detection and emergency contact alerts.
Phone vs Dedicated Computer
Cycling apps on your phone (Komoot, Strava, RideWithGPS) can replace a GPS computer for navigation and recording. The downsides: battery drain is significant, screen readability in bright sunlight is poor, and phones are more vulnerable to rain and crashes. A dedicated computer is more reliable for anything beyond casual rides.
Start with a basic computer or your phone app if you’re new to tracking. As your riding develops and you identify what you actually want to measure, invest in the features that match your goals. For plain-English guides to setting up cycling apps and devices, The Plain Manual covers everyday tech without the jargon.