American Classic makes some of the most exquisitely light and well engineered hubs available. American Classic hubs are lighter than DuraAce, Record, or XTR and are used by many top racers and pro teams around the world. On its rear hubs, American Classic uses a patented six-pawl cassette mechanism that makes it stronger than traditional cassettes. engineered hubs available. Made from a niobium alloy (Nb-Al T10) that is almost twice as strong as 6061-T6 aluminum, the Kinetix ProLite rims are among the lightest and strongest rims in the world. Double walls and a CNC machined braking surface are of course standard. An added bonus is that niobium alloy is substantially more corrosion resistant than standard aluminum Colour Black as shown