The AR is Felt’s fastest race bike, it’s uncompromising in pursuit of efficiency and speed. This latest re-designed version features refined tube shapes and an aero cockpit to create a slippery, aerodynamic profile. Medium (5’6-5’11) View our in-depth size guide here. Reynolds AR 58 Carbon. Pirelli P Zero Velo 25c. Felt Devox Aerobar 40cm.