In-depth review of the Garmin Edge 25. The Garmin Edge 25 is small, super light, and relatively cheap, yet it has most of the super powers of the bigger (and more expensive) bike computers. And the Garmin Edge 25 is the smallest GPS-compatible bike computer in the world. Overall, this Garmin Edge 25 review shows that this tiny bike computer could meet the needs of most average cyclists, and even many competitive cyclists.