Bonanza Helmet - Gloss Black



The Bonanza's interior features a custom-shaped EPS shell, hand-stitched liner with moisture wicking brushed Lycra panels and open-cell foam padding for breathability and comfort.

Technical Details

  • Injection-molded ABS outer shell with hand-painted finish
  • Expanded polystyrene inner shell
  • Hand-sewn removable brushed Lycra liner with contrasting diamond-stitched quilted open-cell foam padding
  • Meets DOT safety standards
  • Rugged plated steel D-ring neck strap with adjustment strap end retainer

Helmet Fitment

Helmets comes in all sorts of shapes and sizes. Just because you are a medium in one doesn’t mean you won’t be a larger or smaller size in another. It’s best to consult a professional if you are having issues determining your size. We also offer cheek pads in various sizes to help fine tune your fit if necessary.

Size chart

Bonanza Helmet - Gloss Black

Size Head measurement US Hat size
XS 20⅞ – 21⅜ 6⅝ – 6⅞ 
S 21½ – 22
6⅞ – 7⅛
M 22⅛ – 22⅝
7⅛ – 7⅜
L 22¾ – 23¼
7⅜ – 7⅝
XL 23⅜ – 23⅞
7⅝ – 7⅞
XXL 24 – 24½
7 – 8⅛
Size Head measurement US Hat size
XS 53 - 54.25
6⅝ – 6⅞ 
S 54.5 - 55.75
6⅞ – 7⅛
M 56 - 57.25
7⅛ – 7⅜
L 57.5 - 58.75
7⅜ – 7⅝
XL 59 - 60.25
7⅝ – 7⅞
XXL 60.5 - 61.75
7 – 8⅛
Play sizing video

In order to best determine fit, we advise comparing our helmet’s measurements to a similar helmets you already own. When taking your head measurement, measure the largest circumference, usually found at your your temple.

For any sizing, styling, or general inquiries, please contact us.

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Customer Reviews

5 Based on 15 Reviews
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dayne a.
United States United States

Helmet Purchases

Flawless as always, thanks for fantastic gear!

Steven E.
United States United States


Great helmet. New favorite

Christie F.
United States United States

Love the bonanza helmet

Amazing!! I love the wind on my face without the helmet moving or choking me out when I get up to speeds of 70mph+

Gene Burrows

Customer review

I just ordered a new liner for my 4 year old gloss black Biltwell Bonanza Helmet & thought I'd leave a "long use" review on the helmet while I was here. As I mentioned, my helmet is 4 years old & has a lot of miles on it now, but I still love it & would buy another in a heartbeat. For some reason, I had a hard time finding a helmet that fit my head properly & must of tried on a hundred different brands & types at the various gear shops & motorcycle dealers here in the SF Bay Area. I eventually found mine at my local BMW dealer in San Jose & knew it was the right one when I tried it on. The dealer had any color I wanted, as long as it was the gloss black, so I was very pleased to see the other various colors available here on the website. Over the time I have had my helmet, I have used several different bubble shields (clear & tinted) on mine & a flip-up visor/faceshield with good effect. But since I added a full-sized windshield on my bike, I now use only a snap-on visor & several different pairs of riding & sunglasses & really enjoy riding with this combination. I feel more connected with nature & relaxed with this combination & really like the fresh air. So, in conclusion, I highly recommend the Biltwell Bonanza as a great choice, especially if you favor the open face style of helmet like I do. Best wishes & ride safe!

Travis Scheck

Customer review

The best helmet I've ever owned!

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