HJC R-PHA ST Knuckle

Innovative Fiberglass Composite


  • Innovative Fiberglass Composite: New Light-Weight FRP Shell Construction. 
  • Max Air-flow Top Vent: Variable air flow is adjusted by glove-friendly intake vent. 
  • Superior automatic shield locking system with spring controlled lever.  
  • 5mm Initial shield position by releasing shield locking system. 
  • RapidFire™ Shield Replacement System: Simple and secure shield ratchet system provides ultra-quick, tool-less removal and installation for efficient operation. 
  • Pinlock prepared shield and Includes Pinlock 100% Max vision Anti-fog insert. 
  • For the perfect and compact dimensions, RPHA ST comes in 3 different shells:
  • 1st shell for XS-S sizing, 2nd for M-L sizing and 3rd for XL-XXL sizing.
  • SilvercoolPlus™(Ginkgo) Interior: Moisture-wicking and odor-free interior with advanced silver anti-bacterial fabric. Crown and cheek pads are removable and washable.
  • Eye glasses and sun glasses friendly EPS shape.

To help find your helmet size, measure the circumference of your head just above your ears (to get the widest measurement), then you can use this table as a guide.

XS Small Medium Large X-Large XXL 3XL
53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm 65-66cm

Choose colour and size


Manufacturer: HJC
View Size Chart

Size chart