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GMax GM54S Derk Modular Helmet

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GMax GM54S Derk Modular Helmet Videos

GMax GM54S Derk Modular Helmet 

The modular design allows the "flip-jaw" to rotate further back on the crown of the helmet. The further rotation of the flip-jaw not only increases the user's line-of-sight when in the raised position, but it also lessens the user's fatigue by maintaining an even distribution of weight across the helmet.


  • New inner flip tint sun lens
  • Inner flip shield is easily raised of lowered with a lever located on the exterior of the helmet
  • Distortion free clear single lens shield
  • New integrated multi-function red L.E.D rear light
  • Optional rear brake light kit available
  • One hand easy to use chin bar push to open mechanism
  • Lightweight D.O.T approved thermo-plastic alloy shell
  • Excellent shield sealing reduces unwanted air and noise
  • GMAX "D.E.V.S" adjustable "dual exhaust venting system", top, side, and rear venting reduces fogging and sweating by allowing hot air to escape from the mouth area and top of head
  • Adjustable chin vent directs air upward across the inside of the shield to help reduce or eliminate fogging
  • Large eye port for improved range of vision
  • Coolmax comfort liner and cheek pads move the moisture away from your body and the fabric dries quickly. The added performance keeps you dry and comfortable
  • Removable/washable interior and adjustable cheek pads allow for more comfortable sizing
  • Deluxe ear pockets for better fit and comfort
  • Built in speaker pockets for communication systems
  • Soft padded chin strap
  • Painted shell with high quality clear coat finish
  • Soft helmet bag included
Write a Product Review for a chance to win our monthly $100 giveaways.
GMax GM54S Derk Modular Helmet 4.6 5 11 11
Good helmet, lots of features, a little heavy though Solid helmet. The light in the back is great and I love the style! It does run a bit heavy, and is a little loud because of all the vents and the open ear cups. Will give your neck a decent workout if you aren't used to it though! Definitely recommended though for it's feature-set and price! December 30, 2013
Great Helmet for all Seasons Fit me good and was very comfortable. Great on a cool morning but lots of vents and the modular design was great as the day warmed up. I will buy another one and recomend it to anyone. I got a lot of compliments on the rear led light I have to think this will be a standard feature on most in the near future. November 25, 2013
Excellent Bang for your Buck This is my first ever motorcycle helmut and I have nothing else to compare it to except my experience trying other helmuts on at stores. When it came down to it, I bought this because of overall bang for your buck factor. No other helmut I looked out had so many features for the money. I am new to riding so dont have much comparison but this helmut's safety light, multiple vents, modular factor and nice conservative look with a little flash is what got me. I am happy with the purchase. The sizing guide was spot on and Revzilla was so easy to deal with. I've only rode a few times with it and I would agree that it is a bit loud at high speeds but again I dont have much to compare to. It's not something that would prevent me from recommending. October 20, 2013
great value for money helmet This is my 1st motorcycle helmet, and I like it. I really like the looks of the Derk Modular version. Its a good bang for the buck. September 16, 2013
great value This is a comfortable helmet. The fit is good. Just a little on the heavy side. Modular flip works well. September 2, 2013
I did not expect the helmet to be so awesome! After reading the reviews prior to me purchasing the helmet, I did not know what to expect. What I got was this great fitting, Completely awesome product. I am a first time bike owner and wanted a helmet that was solid and functional. I think I got it with this one, Thanks Revzilla!! July 27, 2013
This is a great helmet. I love this helmet and I recommend it to any female that is going to ride along with her boyfriend. I got my helmet not to long ago and it was just the perfect fit, and size. July 3, 2013
Good helmet for the price My first helmet and it has worked out great. I love the internal sunshade and it fits well with glasses. The only downside is that I ordered a medium and it seems to have loosened up a bit and doesn't fit as tightly around my head anymore. My hat size is a 7 3/8ths from the military so that's what I went with. Also it seems a little on the noisey side when I get over 50 mph. I figure that is because of the modular aspect and it not fitting as snuggly as it could be. Otherwise this helmet is a great buy and I will definitely be using it until I upgrade. June 28, 2013
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Have a functionality, fit, or otherwise product-specific question about the GMax GM54S Derk Modular Helmet ? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

GMax GM54S Derk Modular Helmet
Already Asked: 6 Questions, 15 Answers
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RevZilla Store asked: Why did you choose this?
Gary W: Like brand and apperance Mar 27, 2014
Andrew N: I picked this helmet because I had seen it in a shop where I live and had a chance to try it on and test out the modular features its has. The helmet feels very solid and provides good air flow when your riding. It also comes in an XS and that is very much appreciated as I have had a very hard time finding a helmet that will fit correctly and do what I want it to. Mar 24, 2014
brent b: I like the look of this one and it had much better reviews than the cheaper helmets I looked at as well as some of the more expensive ones. I had 200 dollars as my self inflicted limit. I wanted a bluetooth but it looks as though anything under 450 isn't worth buying as a single unit. Mar 22, 2014
Rhea s: This is a great helmet and I love it so much. Sep 24, 2013
Chris B: I went with this helmet because of the features and the price. I was originally looking at the regular 54s, but then I saw this styling and really liked it. Sep 8, 2013
Phillip M: Great fit and nice graphic design. Sep 5, 2013
A shopper asked: Will eyeglasses fit in through the helmet? Feb 3, 2013
Answer this · Send to friends Good question? Yes (0) No (0)
RevZilla: This helmet is not designed to accommodate eyeglasses, but they will fit (with some difficulty however). Feb 5, 2013
Reply to RevZilla Good answer? Yes (0) No (0)

Adult Helmet

SizeHat SizeMeasurement (in)
XS6 3/421 1/4 - 21 5/8
SM7 - 7 1/8
22 - 22 7/16
MD7 1/4 - 7 3/8
22 3/16 - 23 1/4
LG7 1/2 - 7 5/8
23 5/8 - 24
XL7 3/4 - 7 7/8
24 3/8 - 24 13/16
2XL8 - 8 1/8
25 3/16 - 25 5/8
3XL8 1/4 - 8 3/8
26 - 26 3/8

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

Click here to see the full GMAX Helmets Size Chart
Product Style RevZilla SKU ID Manufacturer Product # Availability
Flat Black/Silver / 2XL 828109 N1540398 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / 3XL 828110 N1540399 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / LG 825560 N1540396 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / MD 828105 N1540395 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / SM 828106 N1540394 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / XL 828107 N1540397 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / XS 828108 N1540393 F.TC-12 In Stock: Ships within 24 hours