Silca Hiro Side-Lever Locking Presta Chuck - Carbon Steel R1 the GP5000 S TR can

the GP5000 S TR can also be used with compatible inner tubes where appropriate

race-ready SPEEDPLAY ZERO with dual-side engagement offers  peak power transfer with exceptional durability

Eliminates chain contaminants safely

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

fixed on the semi-axles

Silca Hiro Side-Lever Locking Presta Chuck - Carbon Steel R1 the GP5000 S TR canLeaking 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