Tacx saddle clamp for bottle cage when you carry your water bottle behind your saddle it reduces air resistance it is the logical choice for triathlon and time trials where aerodynamics is the key the angle and height of the clamp are adjustable you can have one or two bottle cages mounted features weighs 165g keeps the bike as aero a possible multi fitting holds either one or two bottle cages not supplied buy tacx accessories from chain reaction cycles the worlds largest online bike