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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

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 72 72
Great fit and finish I have an Arai head I don't look at other helmets Great fit and comfort with top notch protection Expensive, but it protects your head. April 9, 2015
Good stuff... I bought this helmet to replace my Arai Vector. I was initially looking to buy the Vector 2, but this helmet seemed to have a more aggressive look that will compliment my cruiser and sport bike. Comparing it to my old helmet, it's quieter and the pin lock system is great. March 17, 2015
great investment arai wasn't my first choice but they won me over. the fit is amazing, light & comfortable. lots of airflow no buffeting under high speed. worth every penny, get a tinted pinlock insert. i will buy this again February 12, 2015
Good helmet BUT......... I bought this helmet under the understanding that it was specifically designed for naked bikes and that the venting is exemplary. I own a Ducati Diavel and I was looking for a replacement to my Schuberth C3 pro due to its poor venting in warm weather (The C3 pro would be perfect if it vented well). My impressions are as follow: Pros: 1. The helmet is a quality item, no doubt about it!!! 2. The venting is top notch......I just love how air flows through the helmet. 3. In the city and up to legal speeds the helmet is stable and perform as advertised. 4. The helmet is stable when you look over your shoulder to check lanes. Cons: 1. The helmet is LOUD! You definitely need ear plugs at highway speed. 2. From an aerodynamic point of you, the helmet does not perform as well at speeds above the legal limit. I was very disappointed because I expected the helmet to perform at least as well as my Schuberth C3 Pro (The quietest and most stable helmet I have tried so far) To recap; this is a good quality helmet with excellent venting and you wont be disappointed as long as you keep it bellow 150km. NOTE: I have tried the Defiant on my BMW K1600GT and the stability issue at high speed, that I complained about on my Diavel, was non-existent. January 9, 2015
The new street standard, BUY THIS! First off, hat's off to Revzilla. No sales tax, fast shipping, and they know how to pack their boxes...don't worry about buying a helmet online. I retired my 5 yr. old Shoei RF-1100 since I ride 5 days a week in all weather (NorCal weather) and I'm sure the UV degraded it a bit. This is the new street standard. I don't care what bike you ride; if it's on the street BUY THIS! The Airflow is AMAZING with no fairing protection and about just as good tucked in. For me, the Shoei fits ON you, this ARAI you fit IN; like a pillow wrapped around your head. It's extremely quiet until about 50 MPH and then some lower range wind noise picks up. I highly recommend wearing No-Noise ear plugs with it. Price is the only downside. This is the only time I bought Solid Black rather than a design due to the cost. Shoei is "affordable", but with Arai I don't think the extra $130 is worth it ($700 helmet design...craazzy). December 22, 2014
Great Helmet Everything about it is perfect. Love the look, great fit and very quiet. October 27, 2014
3XL fits my head! I purchased this helmet because it was for upright riding and available in 3XL. The features seem fine, the helmet is solid, but I don't like how little space is between my mouth and the chin bar. Exhaling through my mouth guarantees my eye glasses get fogged up. I did note rate durability and protection because it is much too early for durability and I hope to never test it's protection. November 11, 2014
Another Excellent Example of an Arai Product A+ I have had the helmet now for about 8-9 months and it is holding up well, in typical Arai fashion. I am assuming it last its expected life cycle without much issue. This is a good helmet for a more upright seated motorcycle ( I am currently on a Triumph Tiger 1050) The ventilation is excellent and the helmet quite quiet for the amount of air it flows. I would recommend this to anyone looking for a quality street oriented helmet that needs some air flow. Also the vents are easy to use with or without gloved hands. September 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, 31 Answers
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RevZilla Store asked: Why did you choose this?
Charles P: My buddy has this helmet and its very comfy, I have to say its a little high in price but at the same time whats your noggin worth? I wasn't able to try all the vents out and really get to know the helmet, but for the time I used it about 2 hrs on his 636 It sold itself to me. Sep 26, 2014
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 Item # Manufacturer Product # Availability
Red / 2XS 886187 818809 In Stock: Ships within 24 hours
Red / XS 886188 818810 In Stock: Ships within 24 hours
Red / SM 886189 818811 In Stock: Ships within 24 hours
Red / MD 886190 818812 In Stock: Ships within 24 hours
Red / LG 886191 818813 In Stock: Ships within 24 hours
Red / XL 886192 818814 In Stock: Ships within 24 hours
Red / 2XL 886193 818815 In Stock: Ships within 24 hours
Red / 3XL 886194 818816 Out of Stock
Green / 2XS 886179 818799 In Stock: Ships within 24 hours
Green / XS 886180 818800 In Stock: Ships within 24 hours
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 In Stock: Ships within 24 hours
Green / 3XL 886186 818806 Out of Stock