The Garmin Edge 510 and 810 bike-mounted GPS units, $329 and $499 respectively, not only track speed, elevation, global positioning, and climb rates, they also use barometric altimeters to get a bead on local weather systems. Don’t worry though, if dark clouds rain on your mountain bike parade, both Garmin Edges are protected against the elements. Even in the wettest conditions, your GPS will continue to broadcast your location to friends and family, track your performance, and provide skill level-appropriate routes for your session.

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