For mounting on an Ahead stem 1 1/8", below the existing headset cover. With a twist, the Com/Smartbag can be mounted vertically or horizontally thanks to the oversized bayonet fitting. The lower extra compartment with rubberized Velcro straps not only provides additional space for keys and cash but also for the +Com/Unit power bank for inductive charging. Splash water and rain protection cover. Smartphone size max. 155x80x15 mm.