The new Edge 840 has improved GPS, a fresh user interface and the option to solar re-charge. The 830 is still an amazing compact touchscreen, stuffed to the gizzards with features. So which should you buy?
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Garmin Edge® 1040 Solar, GPS Bike Computer with Solar Charging Capabilities, On and Off-Road & Varia™ RCT715, Bicycle Radar with Camera and Tail Light, Continuous Recording, Vehicle Detection : Electronics
Garmin Edge 830 vs. Edge 840: Which One to Buy?
Garmin Edge 840 vs 830: What Is The Difference (And Is Solar Worth It)? - Sportive Cyclist