Log In / Register
Cart (0) Checkout
GMax GM54S Derk Modular Helmet

Please select a Size to check availability, or to add this item to your Shopping Cart or Wish List.


Select Size:

Size Chart
Select qty:
Your Savings (25%):
Your Price
Please select a Size to view availability.

Related Videos (2)

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 4.4 5 128 128
Good looking with nice features and fits well As luck would have it, I have not been able to ride since my GM54S in Titanium came in in size large. So I but it on and sat for a few hours as suggested and watched TV. The fit felt fine. No head ache and the weight seemed fine. No neck pain. My head circumference is 22 1/4" x 8" length x 6" width. I guess this makes me an "Intermediate Oval" head shape. The only snug place is the cheek pads (I have a 5 1/2" wide cheek bone) but this should get better when pads break in. The light looks better in hand than in the pitchers. Also the push button switch is flush so it is not to easy to find with gloves on but it looks good so I can live with that. The face shield is easy to change as I put on the silver iridium shield. It took about 10 seconds to do. The latch release to open up the flip-jaw feels solid and is easy to do with gloves on (Fly Street FL2 Gloves). Only gave it a GOOD rating as I have not used it on the road. The weather in NY is kinda bad at this time, but if it gets nice enough to ride I will up date on noise and "ride weight" of this helmet. November 21, 2014
outstanding value as mentioned already in the reviews The value is unbeatable as stated in other reviews. I will make a comment on the fit. I am Chinese like 1 out of 4 people on this earth. My head is LLLarrgge, round and somewhat flat in the back. I have had huge problems finding helmets that fit. I tolerated other helmets but they always had pressure points. This is the first helmet that I can say actually fits me. I have tried on alooooot of helmets believe me and this one fits. This is my second helmet. The first one pooped out after 3 years. hope this helps those with big round heads. November 18, 2014
GMax GM54S Good overall helmet. Doesn't feel to heavy. Only downside is that a lot of air comes in from the neck area, making it a little chilly to ride. The visor fogs up but if you're moving it'll go away pretty fast. November 10, 2014
gmax54s modular helmet I have been pulled over a few times due to the rear flashing reflector. Cops and riders have mentioned that it's so awesome to see a light in the rear flashing for extra visibility. It's what sell the helmet in my opinion. Cars actually stay back when the see the flash of the helmet light. November 10, 2014
Great for the money The only issue I see with this helmet is the small slider rather than a larger release button i have seen on most other helmets to release the front of the helmet to raise it. September 22, 2014
The back light is such a safety feature Great product safe, stylish and light. A great overall value. September 22, 2014
Love this helmet! I have tried several much more expensive helmets and I have found the one I will stick with for a long time. I can not believe the price for what you get. It was so inexpensive that I was very hesitant. I am glad I purchased it. My Sena bluetooth mounts very easily. It even has ear pockets for the speakers. The ventilation is superb. Visibility is very good. I purchased the twin layer visor and could not be happier. It simply does not fog. I ride in western Washington most of the year and this has been great in the rain/cold. November 4, 2014
Great price, great features. You can't beat this helmet in terms of the features it offers and its low price. The modular system works easily and is sturdy. The visor is very easily replaced and the vents provide plenty of air flow for those 90+ days here in Georgia. The helmet fits pretty well although it is slightly heavy so it can really leave a welt on your forehead if you're going on a long ride (over 1.5hrs). And the internal sun visor? Freaking awesome. Get the matte black if you want to be the batman. October 20, 2014
2 3 4 5 ... 16 next>>
Use our Product Q&A for a chance to win our monthly $100 giveaways.

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, 21 Answers
Sort by:
RevZilla Store asked: Why did you choose this?
Kam E: HJC IS MAX BT unimpressed me... -_-
-price(first helmet)
-Lots of vents (desert)
-Back light (night time visibility)
Aug 19, 2014
Faran R: I already have a full face helmet and I wanted a modular for street riding and just get lazy at times with a face full.
After ready reviews from many different websites on sub $200 helmets this seemed to have received the most positive feed back.
Hopefully it doesn't disappoint. Gmax does seem to carry really comfortable helmets for the price.
Aug 7, 2014
Michael E: Had the features I desired. Jun 30, 2014
Stephen N: Needed a good helmet on a budget. This helmet had amazing reviews and comes with great features. Jun 25, 2014
Kevin H: safety conscious older biker Jun 12, 2014
Roberto B: I Have the Non-Modular version of this helmet, and like the style and the rear light. The modular feature makes it easier to talk without removing the helmet. May 2, 2014
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 Item # Manufacturer Product # Availability
Flat Black/Silver / 2XL 828109 NG1540398 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / 3XL 828110 NG1540399 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / LG 825560 NG1540396 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / MD 828105 NG1540395 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / SM 828106 NG1540394 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / XL 828107 NG1540397 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / XS 828108 NG1540393 F.TC-12 In Stock: Ships within 24 hours