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Arai Defiant Base Helmet
  • Frost Black/White
  • Frost Black/White
  • Frost Black/Orange
  • Frost Black/Orange

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Video Reviews (4)

Arai Defiant Base Helmet Videos

Arai Defiant Base Helmet

Designed specifically for the aesthetics and needs of street fighter and naked bike rider in mind, the new Arai Defiant Base 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 Base Helmet 4.6 5 58 58
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
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
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
ARAI got "Harley color" black & orange! Way better than my Harley full face. A lot more air in and out (as says in the video), and much much more lighter than my old one as well. I can tell this helmet has a very good aerodynamic ( even at mid speed, 65~85mph, upright position). Love this helmet!!! Since it comes with pinlock, I personally think you get more for the price, comparing with RX-Q. Yes! It's not a cheap helmet, but you get what you pay for, ARAI !! April 16, 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
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Have a functionality, fit, or otherwise product-specific question about the Arai Defiant Base Helmet? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Arai Defiant Base Helmet
Already Asked: 8 Questions, 37 Answers
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RevZilla Store asked: Why did you choose this?
Douglas B: I bought a 1290 Super Duke R, I have an old Yamaha SR500E and a Big Ruckus. So my Shoei X-12 is a little wrong for that, plus it is older, so I wanted a new helmet and I have enjoyed Arai in the past. The videos on your site were very helpful as well. Jul 17, 2014
Kevin N: Designed for naked bikes with the 3/4 or full upright position. I ride a Diavel Carbon, so it seems a perfect fit! Jun 17, 2014
matthew l: returned due to fit May 8, 2014
David W: I ride a triumph Speed Triple bike and determined this was the best Arai helmet for upright sportbike riding. Apr 17, 2014
John F: Designed specifically for non-faired naked bikes. Oct 30, 2013
Janet F: Thank heavens Arai offers XXXL again! Great venting. Pinlock standard - woo hoo! (Glenn) Oct 12, 2013
John R asked: Hey All, I am right in the middle of a Medium and a Large at 23in head measurement. Whould you recommend I go the larger or smaller route? Thanks... Apr 21, 2014
Answer this · Send to friends Good question? Yes (2) No (0)
Christopher L: Revzillas size guarantee (read details) allows you to make sure you get the right fitment. BUT if you don't want to try one and then the other thru Zilla I'd suggest going somewhere local that has them for you try on, if possible. You may find neither fit you quite right and may need to order the smaller shell w the larger helmet size's cheek pad set, which may become costly. However, It's crucial to keep trying on a helmet and ensure fitment is comfortable. Keep in mind a very slight break in will occur and will very nominally loosen up as the foam forms to your head. Apr 21, 2014
Reply to Christopher Good answer? Yes (0) No (0)
RYAN K: we were in the same spot and went with the larger size we went the right way!
only thing I will say is this helment is a little larger then most on the diameter around chin. love the helment but bigger size seems to give more sticking out in front then most. would we buy again probably so.
Apr 21, 2014
Reply to RYAN Good answer? Yes (0) No (0)
Noah D: I just got this helmet and would tell you normally to go smaller but in this case go up to large. I measure 23-1/2 and the large was too tight. XL was nice and snug. Perfect actually. You will love the helmet! Apr 21, 2014
Reply to Noah Good answer? Yes (0) No (0)
Earl S: Thanks for this piece in info. I measure 23 1/4 and I tried a Large RX-Q and it was too tight as well. I haven't tried the Defiant yet but I assume it will be similar. I'll have to try it locally before I buy from RZ. Jul 11, 2014
John F: I'd go smaller. Padding will loosen up. And you don't want it to be too loose. I think a little tighter is better than a little looser. Apr 21, 2014
Reply to John Good answer? Yes (0) No (0)
John R: I had a vector , I believe that was a medium but can't remember. Are the shell different from a Med' to a Lrg'? Apr 21, 2014
John F: Sorry don't know. Last year I bought a shoei RF 1100 and after a couple months it felt too loose. So I went a hair smaller on the Defiant and I'm glad I did. Jus make sure the top inside head cage isn't causing any pressure hotspots on your forehead. Apr 21, 2014
Timothy B: I was in between a L and a XL and I chose the Large. XL would have been too big Apr 21, 2014
Reply to Timothy Good answer? Yes (0) No (0)
A shopper asked: I have seen your videos on both the Defiant vs RX-Q. I ride a F800R. Im leaning more towards the Defiant becuase of looks but stacked up against the RX-Q , aside from style, any diferences to point out that can help me clairfy my purchase? My commute is 20 miles but through NYC Apr 24, 2013
Answer this · Send to friends Good question? Yes (0) No (0)
Christopher L: I've done quite a bit of research on both products. It seems the Defiant is far superior in terms of design. It's not just "style." It's the function of that style: the adjustable chin curtain to keep excess wind out (might be especially useful on colder days with your naked); the "diffuser"/spoiler @ the base of the helmet for increased stability and noise/turbulence reduction; HEAVY ventilation (possibly the best Arai has to offer...yes, including the Corsair V) due to the monstrous chin ventilation system (three stage: closed, partial open, full open); and from what I can tell, it looks like the vent controls would be easier to control with gloves on.

Bottom line: I have a 2010 Z1000 (nearly 20,000 miles) and a 2007 CBR 600RR with 56,000 miles on it. ALL these miles have been put on with a Shark RSR2 (thick visor, decent ventilation, awesome looks w/the Duhamel white graphic I got, PERFECT fit and comfort, easy visor swap, etc. etc.) I love the Shark and will be having a real hard time finding its replacement. I'm tedious in my research and after fitting many models (haven't fit on a Defiant) and reading about ALL top-line models it's come down to these (for me): Schuberth SR1 and Arai Defiant. The fit for the Defiant is hopefully identical to the RX-Q (which fit me better than a CorsairV) which is the shell it's based off of. Haven't fit on an SR1 but from what I can read, it's "race" fit is superb. Good luck with your decision. Just remember, when dealing with the top-line model of almost anything, you're not going to make a bad choice, it's just that one will be wiser for you than the others. Just figure out which one.
May 27, 2013
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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
Frost Black/White / 2XS 886203 818829 Available: Usually ships in 1-2 business days
Frost Black/White / XS 886204 818830 Available: Usually ships in 1-2 business days
Frost Black/White / SM 886205 818831 In Stock: Ships within 24 hours
Frost Black/White / MD 886206 818832 In Stock: Ships within 24 hours
Frost Black/White / LG 886207 818833 In Stock: Ships within 24 hours
Frost Black/White / XL 886208 818834 In Stock: Ships within 24 hours
Frost Black/White / 2XL 886209 818835 Out of Stock
Frost Black/White / 3XL 886210 818836 Available: Usually ships in 1-2 business days
Frost Black/Orange / 2XS 886195 818819 Available: Usually ships in 1-2 business days
Frost Black/Orange / XS 886196 818820 Available: Usually ships in 1-2 business days
Frost Black/Orange / SM 886197 818821 In Stock: Ships within 24 hours
Frost Black/Orange / MD 886198 818822 In Stock: Ships within 24 hours
Frost Black/Orange / LG 886199 818823 In Stock: Ships within 24 hours
Frost Black/Orange / XL 886200 818824 Available: Usually ships in 1-2 business days
Frost Black/Orange / 2XL 886201 818825 Available: Usually ships in 1-2 business days
Frost Black/Orange / 3XL 886202 818826 Available: Usually ships in 1-2 business days