With that in mind, let's start by mentioning what the Edge 20 doesn't do. As with the Edge 25 there is no power data, but going a step further there's also no cadence, heart rate or live tracking – simply put, there is no ANT+ or Bluetooth for external sensors. Though with a device as basic as this it's strange to see segments supported, giving you feedback for segment start and end points.
As the lightest unit in the Edge range, the 20 weighed in at a feathery 24g on our scales (without mount). The dimensions and resolution are identical to the Edge 25. The mounting system, with its quarter-turn lock, remains familiar for anyone already invested in the Garmin ecosystem.
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