Garmin Edge 840
The Garmin Edge 840 is a highly capable mid-size bike computer that blends touchscreen convenience with physical button reliability, strong navigation, and deep training insights.
- Long-lasting solar battery
- Precise climb tracking
- Reliable touch and button controls
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The Garmin Edge 840 is a highly capable mid-size bike computer that blends touchscreen convenience with physical button reliability, strong navigation, and deep training insights. It's an excellent choice for serious cyclists who want performance data and mapping without stepping up to the larger Edge 1040, though the price point and learning curve may deter casual riders.
Technical specifications
Key features
- Touchscreen with button controls for all-weather use
- Built-in GPS, GLONASS, Galileo and multi-band satellite reception
- ClimbPro ascent planner and real-time climb data
- Mountain bike dynamics: Grit and Flow metrics
- Solar variant option (840 Solar) for extended battery life
- Training readiness, recovery time and HRV status tracking
- Turn-by-turn navigation with rerouting and popularity routing
- ANT+ and Bluetooth sensor compatibility (power meters, radar, lights)
Pros & cons
What we loved
- Fast touchscreen response with backup button controls
- Excellent battery life, especially Solar edition
- Accurate mapping and rerouting on the fly
- Comprehensive training and recovery metrics
- Compact size compared to Edge 1040
- Seamless pairing with Garmin Connect ecosystem
Watch-outs
- Preloaded maps can lack fine detail in rural areas
- Touchscreen can be less responsive with wet gloves
- Price is high compared to entry-level computers
- Some advanced metrics require additional Garmin sensors
- Menu structure can feel overwhelming for new users
Our full review
The Garmin Edge 840 is a compact, touchscreen GPS cycling computer built for riders who want performance-tier navigation and training tools without stepping up to the top-of-the-line Edge 1040. It features a bright, sunlight-readable touchscreen display that also works with physical buttons, a smart compromise for cyclists who don't want to rely solely on touch input during sweaty rides, rough terrain, or wet weather. Its rugged, lightweight housing is designed to withstand the elements, and the unit mounts easily onto any standard Garmin quarter-turn bracket, making it simple to switch between bikes. Battery life stretches up to 26 hours in standard GPS mode, extending further with solar charging on the Edge 840 Solar variant, so multi-day bikepacking trips and long endurance events are well within reach.
The Garmin Edge 840 is a highly capable mid-size bike computer that blends touchscreen convenience with physical button reliability, strong navigation, and…
Where the Edge 840 truly shines is in its navigation and route-planning capabilities. It supports turn-by-turn directions, ClimbPro for pacing hill efforts, and Trailforks integration for mountain bikers who need detailed off-road trail data. Its round-trip routing and popularity routing features can generate rides based on real cyclist data in the area, which is especially useful when exploring unfamiliar roads. The device also connects to Garmin Connect and third-party platforms like Strava and TrainingPeaks, allowing seamless syncing of ride data, routes, and structured workouts. Multi-band GPS support improves positional accuracy in urban canyons, dense forests, and other GPS-challenging environments, giving riders more confidence in their exact location and pacing data.
Beyond navigation, the Edge 840 doubles as a comprehensive training and performance hub. It tracks metrics like power, cadence, heart rate, and recovery time when paired with compatible sensors, and it offers real-time stamina monitoring to help cyclists gauge how much effort they have left during a ride. Built-in workout suggestions adapt to the rider's training history, while features like FTP detection and HRV status provide deeper insight into fitness progression over time. Safety features such as incident detection and LiveTrack allow loved ones to follow a ride in real time, adding peace of mind for solo riders. Altogether, the Garmin Edge 840 blends serious cycling metrics, dependable navigation, and rugged usability into a mid-size bike computer built for cyclists who train seriously and ride far.
