Aero BTS cupThe standard Aero BTS cup on its own for riders who already have an Aero BTS Carbon Saddle Clamp and want a replacement cup or the lighter alternative to the PRO. 800 ml of integrated storage inner tubes, CO2, tools, tyre lever Wide V formation same bottle positions as the PRO cup 60 g lighter than the PRO cup Fits all Aero BTS Carbon Saddle Clamps Holds 2 1000 ml bottles Saddle clamp not included. The Aero BTS Carbon Saddle Clamp is sold separately.