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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 67 67
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
great fit, great aerodynamics, too noisy, a bit janky i'm upgrading from a Shoei RF 1000 with this helmet and at half the price, the Shoei was quieter and felt more solid. while visually i like the aesthetics of Arai's covered visor hinges, they're a bit too fussy and fragile when removing the visor for cleaning. when i close or lift the visor, the ratcheting sound isn't solid and sure like the Shoei. it feels and sounds brittle like something is being stressed or is about to break. also, it only has 3 positions: fully open, fully closed and then slightly ajar. the Max Vision shield pin lock business is equally as fussy to set up and i've not yet determined it's value or advantage. i almost lost one of the pins when installing the shield and it just made me question it altogether. having to set up this brand new helmet that i'm completely unfamiliar with by reading the microscopic instructions and confusing illustrations and photos was such a great test of my patience with an expensive helmet. i have to admit, the airflow and vents on this helmet are supreme. if i lived in a hot/humid climate that would account for a lot. but living in the SF bay area, that's only an issues for maybe 1 month total time in a year. i have yet to find a helmet that has vent levers that don't require walking my fingers across the helmet while riding to determine their location. and this helmet is no different. easily accomplished without gloves, but i never ride without gloves. so... and honestly... 3 logos? are you fricking kidding me? that was the one thing about the looks of this helmet that kept me from buying it for almost 3 months... i finally decided that it's aero qualities outweighed the pummeling brand presence. for as much as this helmet costs, i shouldn't also have to be a billboard for the company. but finally i'll say that the fit of this helmet is perfect for my head, it feels very light and balanced and there is zero buffeting encountered. my current bike does not have a windscreen of any kind, and this helmet was highly praised for that kind of riding. on that note, it delivers. the downside of buying any helmet is that you have no idea of it's performance on your head, on your bike in the conditions you ride in until it's too late to return. i wished i had spent a few extra bucks and gotten the Schuberth C3 Pro or saved a lot of bucks and stayed with the Shoei. while i give the helmet 4 stars, the value for the money isn't there and for that reason i can't recommend it to others. September 22, 2014
This helmet has a great style This helmet is on the bigger side but not too heavy, good style, Comfortable and good air flow August 20, 2014
A great naked bike helmet. The Defiant is a big upgrade for me, coming from a mid-level HJC. I was looking for a stable, quieter helmet. The Defiant fit the bill. A lot of airflow if needed, good fit and comfortable. I still wear earplugs and consider the noise level slightly louder then average. August 18, 2014
Nice helmet, but needs to have earplugs This is a wonderful helmet. However, it is incredibly loud. Fit is wonderful, very comfortable, great airflow... but you NEED hearing protection. It should come with a nice pair of earplugs. I'd recommend it, but with the caveat that it's very loud. August 11, 2014
Great Helmet, I ride a 1290 Super Duke R, this is perfect The helmet is well made, finish is perfect. The pin lock shield works perfectly and is easy to install. The helmet shield is very easy to install and remove. The ventilation is amazing. I am in Texas, on a 100 degree day, the helmet passes enough air to help keep you from sweltering. The air flow is amazing, I went to this helmet from a Shoei X-12 and the airflow is at least double. There is more noise, from the air flow, but you can always reduce the flow easily enough. The fit is perfect for me. The straps are easily used. The helmet has been comfortable on rides of 100 or more miles in high heat. Great helmet, I thought it worth the money. August 5, 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

Embed Video 165 / Arai Fit Guide

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