Ridefarr Alloy Aero Bolt-On Getting Aero If you want to go a little faster on your bike or you want another option for hand placement while riding, aero bars might be the answer. The Ridefarr Alloy Aero Bolt-On features an alloy front extension matched to the low-profile alloy clamps. It is compatible with the Arm Rest Kit for a direct-mount and integrated aero solution. This fits 31. 8mm handlebars and is compatible with GPS Mount 22. 2. Features Fits 31. 8mm handlebars and adds another place to put your hands while riding Lightweight at only 133g Mount a computer to the top with a GPS Mount 22. 2 | Ridefarr | Alloy Aero Bolt-On | Black | 31. 8Mm | Aluminum