Schwinn World DBX Adult Commuter Road Bike N'Litened aluminum Gold Label butted frame with rack and fenders friendly disc drop out and carbon fiber fork Equipped with rear aluminum rack 27 speed Shimano 105 equipped drive train with Shimano Tiagra STI shifters Avid BB5 mechanical disc with Tektro brake levers Jalco double wall alloy rims with quick release alloy hubs and stainless steel spokes