The Unica delivers a perfect balance of speed and stiffness with lightweight and comfort. You get all the stiffness of aluminum where you need it but the carbon fiber seat stays will keep you comfortable for hours on end. Features: Columbus Metal (Max inspired double-oval) 7005-T6 triple-butted aluminum front triangle and chainstays with carbon fiber Tusk design wishbone seatstays. Fork: Columbus Straight Tusk 1-1/8, Head set diameter: Ø 45 mm, Seat post diameter: Ø 31,6 mm , BB shell diameter: BSA, Front derailleur adaptor diameter: Ø 34,9 mm Team Cyclist is an authorized Cinelli dealer and will honor all manufacturer warranties.