The HideMyBell raceday sd created for Specialized, Easton and Fizik direct mount system is the ultimate computer mount. The HideMyBell raceday is a must-have with premium looks and materials. The mount is made of an extremely stiff and lightweight UD carbon composite. This material makes it possible to engineer lightweight in combination with next level stiffness values. For installation we use a M4 nut and bolt compatible with the stem. In this way your navigation sits aerodynamically in front of your handlebars and is securely locked.