Last year I acquired a Garmin Edge 25. Garmin devices like it come with a handlebar mount, but they are less than ideal. The rubber O-rings that it uses to attach tend to break over time, and the mount tends to flex when buttons on the computer are pushed compared to the other available aftermarket mounts. I recently came up with my own design, which I had 3D printed in aluminum by Shapeways. This design is meant to attach to the top two stem bolts, and places the computer directly over the junction of the stem and handlebars. The bracket looks like this:
The bracket uses the Garmin mount inserts made by K-Edge (left), which can be purchased from their site for $5. The K-Edge insert comes with two M3 screws. The K-Edge mounts are threaded, but mine is not, so installation requires two M3 nuts (right) to be bought separately. These can generally be found at any hardware store.
The K-Edge insert attached to the stem mount looks like this.
Attaching the completed mount to the bike requires replacing the original stem bolts with longer ones.
This is the installed mount with a Garmin Edge 25 attached.
This version of the bracket is designed for a stem with bolts separated by 20 mm. I have created a product page on Shapeways for it. The design is easy to modify to accommodate other bolt spacings, and I hope to add other spacing options to the product page soon.
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