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O'Neal 0817-503 Adult Full Face Sierra Helmet Flat Black M 57-58cm 22.4-22.8 in. O'Neal 0817-503 Adult Full Face Sierra Helmet Flat Black M 57-58cm 22.4-22.8 in.

O'Neal 0817-503 Adult Full Face Sierra Helmet Flat Black M 57-58cm 22.4-22.8 in.

$106.62 $177.70 -40%
03:58:05
Limited Time Offer
Estimated delivery dates: Nov 09 2025 – Nov 10 2025
Secure payments SSL encrypted
Free returns 15-day policy
Fast shipping 2-3 days
Quality guarantee 1-year warranty

Experience ultimate protection with the O’Neal Sierra Helmet. Designed for adult riders, this full-face helmet offers a sleek flat black finish and a comfortable fit for head sizes 57-58cm (22.4-22.8 inches).

• Full-face design for maximum protection
• Sleek flat black finish
• Fits head sizes 57-58cm
• Comfortable and secure fit
• Ideal for adult riders
• Original Box and Dust Bag

See photos for condition:

Box handle is broken

Product Information

Category Sports & outdoors > Outdoors > Biking Equipment
Size N/A
Brand O'Neill
Condition Like new