Key Features: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,Designed for riders that prefer the feel of a more traditional bottle the Crono TT is a narrow, 66 mm, 400 ml 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,The bottle is 100% BPA Free.