Felt’s High Modulus carbon fiber frame and fork is a proven performer, providing excellent torsional stiffness for out-of-the-saddle efforts while still offering vertical compliance and vibration damping for comfort no other material can touch. Shimano’s Ultegra SL gives pro-level performance and helps make the F4 SL one of the most affordable full-carbon fiber bikes on the market.Frame:Felt HM Modular Carbon Fiber Frame with 3KP Finish. Forged Dropouts & replaceable hanger Fork:Felt HM 1.3 carbon fiber Components:Shimano Ultegra SL, 20 speed Wheelset:Shimano RS20, 16H front/20H rear Finish:Gloss Gray & Clear Carbon Sizes:700c x 50, 52, 54, 56, 58, 60cm Weight:17.87 pounds/8.12kg