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Arai Defiant Asteroid Helmet
  • Arai Defiant Asteroid Helmet
  • Arai Defiant Asteroid Helmet
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Video Reviews (4)

Arai Defiant Asteroid Helmet Videos

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
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Arai Defiant Asteroid Helmet 4.6 5 58 58
Way too loud for a premium helmet. Extremely disappointed. You can't return helmets after riding with them which is a problem for this helmet. Medium fits me extremely well. Arai has awesome fitment. Air flow is fantastic good features but man is this thing loud at hi-way speeds. Loud to the point you need ear protection to protect your ears from damage. To compare I have a 3/4 open face helmet and on the hi-way wind obviously slips by to the ears making it noisy. The noise with this helmet is equal to my 3/4 but it has more of a buffeting noise making the noise feel more damaging to my ears. I have tried placing my head in various positions to avoid this and cant. It's apparent that this is an engineering design flaw for the helmet. The noise appears to be coming from near the covers of the visor mechanics. I'm quite surprised this wind noise issue slipped by the R&D and quality control process as if you look at other Revzilla reviews there are quite a lot of complaints of the defiant being noisy. For the street and no hi-way the helmet performs quite well and is a joy but for a premium helmet it should excel at both street and hi-way which is why I don't recommend it and why my overall score is low because now I have to sell it used and lose money on the purchase and then buy an rx-q which has significant praise of being a quiet helmet. July 19, 2014
very aerodynamic, great for naked bikes. I like the helmet, it's light, quiet with earplugs and my head doesn't bobble around anymore. July 8, 2014
Very comfortable, high quality. As soon as you put the helmet on, you notice the high quality of the item. It is very comfortable. The padding is excellent and the vents do move a lot of air. It is also one of the best looking helmets I have ever seen. However, an internal sun visor would be nice for this much money, and it is louder than I expected, especially with the brow vents on the shield open. It was bad enough at highway speed that I closed them immediately and haven't opened them since. It is a rather expensive helmet but as they say, you get what you pay for. And honestly, can you put a price on your brain? June 23, 2014
Great Street Helmet for Naked Bikes The helmet fits similar to Shoei helmets (X-12, and RF-1200). Intermediate Oval. Easy to put on and off, and has decent airflow with the vents open. I noticed that it's not that great in a tucked position with your head down, but riding upright, the air just goes around without pushing your head around. All in all, it's a great street helmet. The matte black finish is easier to clean that the matte black from Shoei. The Shoei matte blacks seems to absorb every fingerprint. June 16, 2014
The answer I needed! This is only the second helmet I've used, my first being an entry level HJC-CL16. I ride a '99 Buell Cyclone, a naked bike with a more upright riding position. I was CONSTANTLY plagued by neck fatigue and cramps in my upper shoulders with the HJC. The video and features of the Defient caught my attention and I figured it was worth a shot. I purchasd a small (wore an XS in the HJC), but needed to order the XS (35mm) replacement cheek pads to tweak out the fit before the first ride. And now? Absolutely no more neck pain! Don't know if it's the lighter weight of the Defient or the aerodynamic features of the helmet, but regardless, it worked! The airflow is great, particularly the large chin inlet. Wind noise is loud, but I typically wear ear plugs for any longer rides anyhow. The helemt does catch a bit in the wind when doing a headcheck, but I've adjusted to this. I can also wear my sunglasses without any pinching of the arms on the sides of head/ears. All in all, VERY happy with this lid. June 4, 2014
Great product - so light, comfortable and ultimate protection Great product - really cut wind an wasn't loud - I have termy exhaust and thought the wind and sound would be an issue - helmet worked well for noise reduction ( other reviews made me concerned ) - there is arai and the rest ... May 12, 2014
Best helmet I have ever owned! Fantastic fit and comfort! Great airflow, but yet quiet! May 5, 2014
Arai Quality As Usual!!! Great Helmet that allows exceptional airflow due to it's many venting options, even with all vents open the noise level is not bad. The Defiant comes with the SAI max vision shield pinlock ready with a clear pinlock lens for an antifog ride. The Black Mate finish will scratch easily if not taken care of. Don't go cheap when it comes to your protection!! Arai makes a great product and this helmet looks great with my Ducati Monster!! April 22, 2014
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Have a functionality, fit, or otherwise product-specific question about the Arai Defiant Asteroid Helmet? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Arai Defiant Asteroid Helmet
Already Asked: 6 Questions, 30 Answers
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RevZilla Store asked: Why did you choose this?
ken j: this helmet is the best I have ever had. I had to wait for over a year to order it as no one had it. I checked all sites for over a year and revzilla had it first. May 25, 2014
jeremiah r: I like aria helmets Apr 7, 2014
Shakhia G: Excellent reviews. Dec 15, 2013
Marc S: Cool looking and colors match my bike! Sep 4, 2013

Arai Helmet Sizing

Wrap a cloth measuring tape around your head just above your eyebrows. Pull the tape comfortably snug, and read the length.

Size Head (in) Head (cm)
2XS 20 - 20 1/2 51 - 52
XS 20 7/8 - 21 1/4 53 - 54
SM 21 5/8 - 22 55 - 56
MD 22 1/2 - 22 7/8 57 - 58
LG 23 1/4 - 23 5/8 59 - 60
XL 24 - 24 3/8 61 - 62
2XL 24 3/4 - 25 1/8 63 - 64
3XL 25 1/2 - 26 65 - 66

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

Click here to see the full Arai Helmets Size Chart

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Product Style RevZilla SKU ID Manufacturer Product # Availability
Red / 2XS 886187 818809 Available: Usually ships in 1-2 business days
Red / XS 886188 818810 Available: Usually ships in 1-2 business days
Red / SM 886189 818811 In Stock: Ships next business day
Red / MD 886190 818812 In Stock: Ships next business day
Red / LG 886191 818813 In Stock: Ships next business day
Red / XL 886192 818814 Available: Usually ships in 1-2 business days
Red / 2XL 886193 818815 Available: Usually ships in 1-2 business days
Red / 3XL 886194 818816 Out of Stock
Green / 2XS 886179 818799 Available: Usually ships in 1-2 business days
Green / XS 886180 818800 Available: Usually ships in 1-2 business days
Green / SM 886181 818801 In Stock: Ships next business day
Green / MD 886182 818802 Available: Usually ships in 1-2 business days
Green / LG 886183 818803 Available: Usually ships in 1-2 business days
Green / XL 886184 818804 Available: Usually ships in 1-2 business days
Green / 2XL 886185 818805 Available: Usually ships in 1-2 business days
Green / 3XL 886186 818806 Available: Usually ships in 1-2 business days