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O'Neal Sierra II Helmet
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  • O'Neal Sierra II Helmet - Flat Black
  • O'Neal Sierra II Helmet - Flat Black
  • O'Neal Sierra II Helmet - Flat Black
  • O'Neal Sierra II Helmet - Flat Black
  • O'Neal Sierra II Helmet - Flat White
  • O'Neal Sierra II Helmet - Flat White
  • O'Neal Sierra II Helmet - Flat White
  • O'Neal Sierra II Helmet - Flat White

Please select a Color and Size to check availability, or to add this item to your Shopping Cart or Wish List.

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Flat Black
Flat White

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Size Chart
Price
$149.99

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Please select a Color and Size to view availability.
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Related Videos (2)

O'Neal Sierra II Helmet Videos

O'Neal Sierra II Helmet

Features:

  • Shell is constructed from ABS
  • Moisture wicking, removable/washable air channeled comfort liner
  • Vent holes for optimal ventilation
  • Integrated face shield
  • Height adjustable helmet shield
  • Padded chin strap with double-d safety lock
  • Meets DOT safety standards
  • Designed for Street, Enduro, Side by Side and Adventure riding

Mens Helmet

Size Head (cm)
XS 54
SM 56
MD 58
LG 60
XL 62
2XL 64

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How To Measure

H Head Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.
Product Style RevZilla Item # Manufacturer Product # Availability
Flat Black / XS 1223674 0817-501 Available: Requires 1-2 business days lead time prior to shipment
Flat Black / SM 1223675 0817-502 Available: Requires 1-2 business days lead time prior to shipment
Flat Black / MD 1223676 0817-503 In Stock: Ships within 24 hours
Flat Black / LG 1223677 0817-504 Available: Requires 1-2 business days lead time prior to shipment
Flat Black / XL 1223678 0817-505 Available: Requires 1-2 business days lead time prior to shipment
Flat Black / 2XL 1223679 0817-506 Out of Stock
Flat White / XS 1223680 0817-511 Available: Requires 1-2 business days lead time prior to shipment
Flat White / SM 1223681 0817-512 Available: Requires 1-2 business days lead time prior to shipment
Flat White / MD 1223682 0817-513 Available: Requires 1-2 business days lead time prior to shipment
Flat White / LG 1223683 0817-514 Available: Requires 1-2 business days lead time prior to shipment
Flat White / XL 1223684 0817-515 In Stock: Ships within 24 hours
Flat White / 2XL 1223685 0817-516 Available: Requires 1-2 business days lead time prior to shipment

Shipping

Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.

Returns

If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

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Have a functionality, fit, or otherwise product-specific question about the O'Neal Sierra II Helmet? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

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Browse 2 questions Browse 2 questions and 1 answer
Does the face shield lock in completely? Based on the pictures, it looks like there is a gap and that it does not have a complete, air-tight seal.
A shopper on Jul 10, 2017
BEST ANSWER: Yes, the face shield on the Sierra II Helmet locks into place for an air-tight seal.
how does this fair in terms of aerodynamics and wind resistance in freeway riding?
A shopper on Sep 22, 2017