Screen: 3.2in / 81mm colour touchscreen, 480×800 pixels.

Compatibility: ANT+, SRAM eTap, Campagnolo EPS, Garmin Varia (but not Shimano Di2).

Training data: Speed, altitude, power, heart rate, cadence, calories, gears (for non-Di2 electronic drivetrains), distance, time, temperature, navigation, performance monitoring and more.

Navigation: Fast rerouting even over complex route networks, on the fly climb profiles.

The Karoo 2 is based on an Android operating system.

Read our full Garmin Edge 1040 Solar review.

Garmin Connect also enables you to integrate data from Garmin smartwatches, to give you 24/7 fitness and training status analysis. It links automatically into the best-in-class Garmin Connect training infrastructure, giving you route planning using Garmin’s heatmaps from its rider community and lots of post-ride analysis options that others make you pay for. It’s highly configurable and records loads of training stats. The Edge 1040 is much more of a training aid than just a ride recorder, so it gives you your training status, recovery time and more. Size-wise, it’s a large device, a tiny bit larger than the Edge 1030 Plus, but it’s got 64GB of memory, so it can store twice as much data. There’s a non-solar option as well, which costs less. We regularly gained 10 minutes per hour of extra charge on summer rides.

Garmin’s latest top-end computer has a neat trick – there’s a solar glass screen that can extend your runtime up to an industry-leading claimed 45 hours. Screen: 3.5in / 89mm colour touchscreen, 282×470 pixels.

Compatibility: ANT+, Shimano Di2, SRAM eTap, Campagnolo EPS, Garmin Varia.Connectivity: ANT+, Bluetooth, WiFi, USB-C.Training data: A huge number of training metrics including training status and load, VO2 Max and recovery time.Navigation: Full colour with turn-by-turn routing and rapid rerouting.

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