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Brembo RCS radial brake master cylinders allow the rider to choose between power or precision in relation to road conditions
Fasten Fit Control
is the helmet’s unique and patented A-Head Fitment System
The convenient “flip-up” versatility of a true two-in-one helmet combined with next-level aerodynamics
ARAI QUANTUM-X RAY BLACK Size:L Brembo RCS radial brake masterPurpose built for the street. A new benchmark in comfort, quiet, stability and ventilation. Arai applied the same tireless 24 7 focus devoted to our race helmets to designing it, refining and adapting proven concepts to a new purpose. On the rounder end of the head shape spectrum, the Quantum series has always been the "go to" helmet of choice. The new Quantum X brings that shape back in a feature rich package.