Wahoo ELEMNT Bolt V2 Aero Out Front Mount Super Aero The patent-pending integrated mount for the ELEMNT Bolt GPS bike computer is made of durable, lightweight plastic. It also comes with an optional locking screw that is UCI-compliant for connecting your ELEMNT Bolt to your bike for weigh-ins. It is designed to fit 31. 8mm round bars and works exclusively with the newest ELEMNT Bolt. Features Made of durable, lightweight plastic Designed to fit 31. 8mm round bars Weight: 0. 9oz | Wahoo Fitness | Wahoo Elemnt Bolt V2 Aero Out Front Mount Black