MOUNT - 1-1/8" diameter steerer tube, 5mm height * Supported Computers - Garmin Edge 200, 500, 510, 800, 810 & Forerunner 310XT, 910XT * WEIGHT - 21 grams fixed / 25 grams adjustable * COMPATIBLE - ¼ Turn Garmin Edge Computers, can be oriented for the Forerunner 310XT/910XT * POSITIVE - Advanced injection molded co-polymer interface retains K-EDGE"s signature definitive click with four locking points