Whilst many teams continue to race and win using our crono cx aero bottle and cage system, extensive consultation and testing over the 2018 season demonstrated a requirement for something different in certain situations Features: designed for riders that prefer the feel of a more traditional bottle the crono tt is a narrow, 66 mm, bottle with an aerodynamic frontal area the narrower profile tucks it behind the broader, kamm-tail style downtubes used by many modern aero frames, greatly reducing turbulence compared to a full width bottle in use this is a halfway house between our crono cx system and a traditional bottle, giving better aerodynamic properties than a traditional cage but with a form some riders will find more practical to use custom 66 mm carbon racing rage weighs only 20 grams, contributing to a total system weight of just 70 grams bottle is 100% bpa free