Black/Yellow O’Neal Sierra 21 R Helmet

Whether you ride on the pavement or the dirt or both the Sierra 21 R has the features you need for your next two-wheel adventure. Combining a full windscreen and a visor with a drop-down tinted shield, the Sierra II helmet will get you anywhere you want to go.


  • Shell is constructed with ABS
  • Weight: 1590g (±50g)
  • Moisture-wicking, removable/washable air channeled comfort liner
  • Vent holes for optimal ventilation
  • Integrated face shield with UV protection
  • Height adjustable helmet shield
  • Padded Chin Strap with Double-D safety lock
  • Meets DOT and ECE 22.05 safety standards
  • Designed for Street, Enduro and Adventure Bikes
  • Replacement parts available

O’Neal Sierra 21 R HelmetBlack/Yellow


Designed for Street, Enduro and Adventure riders the O’Neal Sierra 21 R Helmet is constructed with ABS and has moisture-wicking, removable/washable air channeled comfort liner.

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This product is currently out of stock and unavailable.

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Additional information

Size Helmets Adult

Medium, Large, X-Large