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.
Weighs - 165g
Keeps the bike as aero a possible
Holds either one or two bottle cages (not supplied)
Buy Tacx Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.