K-EDGE TT Mount for Garmin Edge/Forerunner ¼-turn Type Computers 22.2mm BlackAdvanced Time Trial and Triathlon computer mount, featuring a twist lock system to secure the Garmin computer between narrow aero bars. This is done by turning the mount to lock to the computer between and below the aero bar extensions, making it ideal for larger EDGE computers like the 800 and 810. Compatible with 22. 2mm diameter TT Extensions Compatible Computers: Garmin Edge 200, 500, 510, 800, 810 and Forerunner 310XT, 910XT NC Machined 6061 T6