The zipp aerobar vuka alumina clip top mount with carbon race extensions will allow you to stay comfortable and in the aero position for longer providing security adjustability and fit the alumina clip has a large armrest for added comfort and a 222mm clamp meaning it will fit the vuka extensions and most other extensions on the market meanwhile the race aerobar extensions feature internal cable routing and is designed to place the wrists at a more natural bend to prevent strain and disco