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Arai Defiant Asteroid Helmet
  • Arai Defiant Asteroid Helmet
  • Arai Defiant Asteroid Helmet
  • Arai Defiant Asteroid Helmet - Green

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Video Reviews (4)

Arai Defiant Asteroid Helmet Videos

Shape: Intermediate Oval

Weight: 3.73 lbs

What's this?

Arai Defiant Asteroid Helmet

Designed specifically for the aesthetics and needs of street fighter and naked bike rider in mind, the new Arai Defiant Asteroid is equally aggressive and feature rich, as one would expect from a new Arai helmet. Based on the fit and comfort of the Quantum, the Defiant was built for the upright riding position with its aggressive, integrated chin spoiler, which was designed specifically to guide wind around the neck and to improve the aerodynamic properties of the helmet. The Hyper Ridge Bumper circles the bottom of the shell both adding additional strength and also lowering the helmet's center of gravity, while flaring the helmet opening slightly to increase the ease of putting on, and taking off.

The Arai Defiant utilizes Arai's latest faceshield design, the SAI Max Vision Pinlock Shield with Brow Vents and includes Pinlock insert lens. The SAI Max Vision shield has been widened by 5mm left and right and offers one of the widest eyeports available for excellent peripheral vision.  


  • Aggressive new styling
  • Internals are redesigned with a focus on safety and comfort
  • Organic shell shape for superb energy management
  • New IC-4 Upper Intake vents seal more completely when closed
  • New ACR-4 flow thru exhaust vent allows greater air flow when open and reduces drag when closed
  • FCS R (Facial Contour Support) cheek pad design has 5mm peel away micro fit layer for greater personal fit
  • Cheek pads feature contoured shape, multiple density foam layer supported by a patented spring
  • New shell shape is easier to put on and take off
  • New water repellent material along bottom edge
  • Pull down spoiler works with new flared bottom to increase helmet stability
  • SAI Max Vision® Brow Vent Pinlock anti-fog lens insert included
  • DOT and Snell 2010 certified

Arai Helmet Sizing

Size Head (cm)
2XS 51 - 52
XS 53 - 54
SM 55 - 56
MD 57 - 58
LG 59 - 60
XL 61 - 62
2XL 63 - 64
3XL 65 - 66

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
Red / 2XS 886187 818809 Only 1 Left: Ships within 24 hours
Red / XS 886188 818810 Only 1 Left: Ships within 24 hours
Red / SM 886189 818811 Out of Stock
Red / MD 886190 818812 Out of Stock
Red / LG 886191 818813 Out of Stock
Red / XL 886192 818814 Out of Stock
Red / 2XL 886193 818815 In Stock: Ships within 24 hours
Red / 3XL 886194 818816 Out of Stock
Green / 2XS 886179 818799 Only 1 Left: Ships within 24 hours
Green / XS 886180 818800 Out of Stock
Green / SM 886181 818801 In Stock: Ships within 24 hours
Green / MD 886182 818802 In Stock: Ships within 24 hours
Green / LG 886183 818803 In Stock: Ships within 24 hours
Green / XL 886184 818804 In Stock: Ships within 24 hours
Green / 2XL 886185 818805 Only 3 Left: Ships within 24 hours
Green / 3XL 886186 818806 Out of Stock


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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.


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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Arai Defiant Asteroid Helmet 4.7 5 141 141
simply, i love it everything as expected, slightly large, great material, good locks, and really light and comfy I highly recommend it April 20, 2016
Favorite Helmet I've owned three Arai Helmets. This one is my favorite. I find it fits great, is very comfortable, and relatively quiet. I love the pro shade and visor. The ventilation is excellent also. Style wise, I was a little turned off by the "wing" on the rear but have gotten used to it. I'd highly recommend it. April 17, 2016
Awesome helmet! This helmet is great. The fit and finish is excellent. I was deciding between this and a Schuberth C3 Pro however this seemed to fit me better. It's not the lightest helmet I've tried but it's certainly not heavy by any means. The plush padding and inside make the helmet so comfortable to wear even on long rides. It's pretty quiet and the Pro Shade system is truly functional. I'm by no means a speed demon but I can say up to 90mph it remains still without vibration and noise. I'd certainly recommend this product! April 16, 2016
Great Helmet Noob to the motorcycle world, wanted to do it the right way starting with gear and wow what a great helmet the attention to detail with all the air flow and pinlock design are outstanding. I removed a layer of the cheek pad to better fit my face and it was very easy to do so. Arai rocks! Expensive but worth every penny. April 6, 2016
Helmet gets noticed. Love the black & white scheme with a touch of red. Compliments my bike. Airflow is great. Cools around the temple. Gets noisy at highway speeds, but I have ear plugs, so it's not an issue. Fits perfectly, and with Arai, the pads are adjustable if you really want to fine tune and tailor the fit. Vents are easily adjustable and accessible with the left-hand. Inner mirror fogs up a bit. I've installed the anti-fog pin lock, and don't have an issue but at night, there's some light distortion, but you get used to it and becomes a non issue. Would highly recommend this product. April 6, 2016
nice, comfortable helmet This is my second Arai helmet. All of the adjustments for air flow work great. It stays quiet until about 85 mph, then gets quite loud. Other than that, it fits great and is very comfortable. April 5, 2016
Best Helmet I've Owned Wow, I've never coughed up the money for a true top of the line helmet, but this was more than worth it. Pros: Style Comfort - Soft and light, with very little wind drag Noise level - It is quiet, but I would still recommend wearing ear plugs above 55mph, it is not silent. Air Flow - Air flow is great, but the helmet is much louder with the vents open. Cons- Visor is a little intimidating to remove/replace Chin strap can be difficult to clip The cons say it all. This is a great helmet, I've been wearing it for 3 months now and I've never looked back or regretted my purchase. I highly recommend this product. March 29, 2016
Nice fit that's what got me. Fits great. The vents do a real good job of keeping you cool. But over 40 this helmet gets pretty darn loud. I ride with earplugs but it's still way louder then my last $50 helmet. :( oh well can't return it once you find this flaw. Bummer for me. March 10, 2016
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