AERO Calf Sleeves Size:S Valve extension 30/40/60mm from BO

Valve extension 30/40/60mm from BO WELL used for presta valves for carbon wheels with high-profile rims

Transform your HADRON² Classics or HADRON² Ultimate wheels

Built around the specifically engineered 180 straightpull hub with refined flanges

The construction focuses on the areas where aerodynamic benefits can be achieved most efficiently

AERO Calf Sleeves Size:S Valve extension 30/40/60mm from BODeveloped by Swiss Side's aerodynamic experts, these sleeves are designed to reduce air drag to save up to 8 watts on the bike course of triathlon competitions. Suitable for all triathlete types they offer a non compressive aero fit for easy application and removal during transitions. Sizes : S: < 35 cm M: 35 37 cm L: >37 cm Sizing tips: For a better fit, choose one size smaller if unsure. If you have thin ankles and larger calves, go for size M for a