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GMax GM54S Derk Helmet

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Shape: Round Oval

Weight: 4.34 lbs

What's this?

GMax GM54S Derk Modular Helmet 

The modular design of the GMax GM54 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.


  • Inner flip sun shield is easily raised of lowered with a lever located on the exterior of the helmet
  • Distortion-free clear single lens face shield
  • Integrated multi-function red LED rear light
  • One hand, easy to use chin bar push-to-open mechanism
  • Lightweight thermo-plastic alloy shell
  • Excellent shield sealing reduces unwanted air and noise
  • D.E.V.S 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
  • Removable and 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
  • Optional rear brake light kit (sold separately)

GMax Helmet Sizing

Size Head (cm)
XS 53 - 54
SM 55 - 56
MD 57 - 58
LG 59 - 60
XL 61 - 62
2XL 63 - 64
3XL 65 - 66
4XL 67 - 68

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

How To Measure

H Head Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.
Product Style RevZilla Item # Manufacturer Product # Availability
Flat Black/Silver / 2XL 828109 G1540398 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / 3XL 828110 G1540399 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / LG 825560 G1540396 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / MD 828105 G1540395 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / SM 828106 G1540394 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / XL 828107 G1540397 F.TC-12 In Stock: Ships within 24 hours
Flat Black/Silver / XS 828108 G1540393 F.TC-12 In Stock: Ships within 24 hours


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We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
GMax GM54S Derk Helmet 4.4 5 181 181
A MUST Buy!! I have had countless helmets over the years but this one ices the cake. It feels just better on my head. I can see more to the sides that any other helmet and the brake light with built in sun visor is just icing to the cake! Buy this one, you won't be disappointed! April 5, 2016
Good features, big shell size. The size of this helmet (the shell) is very large on your head! But GMax did a good job of taking weight off of it. March 30, 2016
On a budget? I've had this helmet for almost 2 years now and have had no problems with it all. At the time I was light on cash but was in need of a decent helmet with ok reviews and this went beyond my exceptions for the price. Nothing over the top in features but if youre new to riding and need something quick, pick this up. I now use it as a back up/passenger helmet. As always shipping from from revzilla was spot on. March 1, 2016
A Functional Modular On A Budget I've always been a half helmet guy, from the entry level Fuel line to my Bell Rogue. Finding a 3X to comfortably fit my large noggin was difficult. Living here in Florida and getting around a thousand miles a week of saddle time, I inevitably end up in the rain at some point. Not just any rain...I'm talking about the kind where sane people put on their 4 ways and look for the shoulders. Me? I'm on 2 wheels and have places to go and people to see. No stopping for this guy. Rain in the face at 70 MPH is unpleasant. It's like a billion angry garden gnomes took up their Daisy Red Ryders and are having a go at your grill. It stings. It reduces vision. It ain't fun. Add to that the flocks of....post retirement age seniors from up north we get who are completely unaccustomed to these deluges and drive worse than they normally do. Lots of folks on 2 wheels go down. I bought this helmet as insurance against all of the above. The price was smoking hot, and once the helmet is broken in, it's not that uncomfortable. Yes, it's substantially heavier than my wife's modular, but hers cost twice as much. It's heavy, but my over-sized pumpkin has a large and strong neck underneath it. It's also pretty loud, but I overcome that with the built in ear pockets and an inexpensive bluetooth solution. It's also pretty durable, and stylish looking, and the built in retractable sun visor is the bees knees. If it were stolen, I'd buy it again, seeing as how I have so much money left over from the first one. Revzilla does NOT play around with shipping either. It arrived quickly, and I was able to track it the entire time to prevent some less than stellar citizen from snaking it off of my porch. Pros: Comfortable, budget priced, adaptable Cons: Heavy, a tad more wind noise than I like in a modular. March 1, 2016
Good enough for this pricepoint A lot of the vents and plastic on the outside of the helmet feel a little weak/cheap. The rear LED is not super bright. Overall the fit is great and the helmet has great features. I was able to fit my headphone speakers in to the little pouches built in to the cheek pads. I like the chin skirt that came with the helmet, and also that its removable. I'm sure I'll keep this helmet for a few years. January 19, 2016
Not the best helmet in the world. It's a cool, cheap little helmet, but or the price, it's not worth it. I bought two of these for myself and my girlfriend, and right out of the box, parts fell off. Nothing too major, just cosmetic, so I didn't mind at the time; I figured I just got a bad model, but the exact same thing happened to the other helmet for my girlfriend. after a while, I noticed the modular locking mechanism wasn't locking on the right side, now I'm not sure if this is individual to my helmet or both, I haven't checked yet, but very disconcerting. On top of all that, the sizing doesn't seem to be indigenous to the actual shell; I believe the sizing of the helmet is just more or less padding on the inside. All in all, just go for a bell revolver, or any other modular. To me, this is just a Chinese P.O.S., and I'll be looking to replace it in the near future. The only reason I haven't exchanged it was that the majority of the problems popped up whilst riding. January 6, 2016
Lots of features. I bought this helmet for my GF, and I love the light up bar on the back of the head. The modular style is very comfortable and another nice feature is the removable wind blocking fabric at the chin. October 5, 2015
Very pleased Purchased because of past experience with this brand. Very satisfied overall. September 21, 2015
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