This is a mount I designed and made for my Magellan Cylco 105 Speedo. I have two bikes so my Mountain bike got the Genuine mount and my old bike got the 3D printed version. I have included the Openscad source files so that you can make changes. See instructions. Inspiration from thing 96504 "Garmin Edge 510/810 Mount" by andiwuThe Openscad source file will allow you to change some parameters. barDia: The diameter of the bar the speedo will mount on barAngle: The angle between the mounting bar and the Speedo The bridge function is used so that you can print the top flange with minimal supports. Print with supports on and remove supports carefully. You will also need to remove the "bridge" carefully with a knife. I printed it in ABS as it is more flexible than PLA and easier to remove the support material. I used an old tube between the mount and the bar and then cable tie it in place. I have used this successfully for road riding and it seems quite sturdy. I wouldn't feel too comfortable with rough off road riding however