Silca Hiro Side-Lever Locking Presta Chuck - Carbon Steel R1 keeping you both confident and

keeping you both confident and in control

This ensures the Mattone will remain ‘high and tight’ under your saddle until you need to access it

The customized fit and dual-sided entry will allow you to crank on the pedals in confidence and comfort

fixed on the semi-axles

Expandable back pockets for maximum storage that keep jersey laying flat

Silca Hiro Side-Lever Locking Presta Chuck - Carbon Steel R1 keeping you both confident andLeaking 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