Silca Hiro Side-Lever Locking Presta Chuck - Carbon Steel BF Apparel 8mm and 35

8mm and 35

Hollowtech II spindle

The RC903 uses two independent BOA® Li2 dials

Shimano’s surround wrapping upper completely envelops the foot for an exceptionally stable fit

Silca Hiro Side-Lever Locking Presta Chuck - Carbon Steel BF Apparel 8mm and 35Leaking chucks are a thing of the past with the HIRO locking chuck. Use it on short valves, disc wheels, and any other Presta valve you can throw at it. Years ago while Josh was working with the Team CSC at the Dauphine Libere, he noticed one of their mechanics using the most amazing little chuck to manage the disc wheel inflation. Unlike anything he had seen before, it was all metal and used a 'lollipop' lever on the side to lock onto the valve stems