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GMax GM54S Derk Helmet
  • GMax GM54S Derk Helmet    - Flat Black/Silver

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Video Reviews (3)

GMax GM54S Derk Helmet Videos

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 next business day
Flat Black/Silver / 3XL 828110 G1540399 F.TC-12 In Stock: Ships next business day
Flat Black/Silver / LG 825560 G1540396 F.TC-12 In Stock: Ships next business day
Flat Black/Silver / MD 828105 G1540395 F.TC-12 In Stock: Ships next business day
Flat Black/Silver / SM 828106 G1540394 F.TC-12 In Stock: Ships next business day
Flat Black/Silver / XL 828107 G1540397 F.TC-12 In Stock: Ships next business day
Flat Black/Silver / XS 828108 G1540393 F.TC-12 In Stock: Ships next business day


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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.

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GMax GM54S Derk Helmet 4.4 5 192 192
Excellent for price I am very satisfied with this helmet. Airflow in summer time is great. If your looking for a helmet that has all the features of high end then look no further. August 24, 2016
Nice budget helmet I bought this helmet a few months ago and it's been great. I'll start with some pros: This helmet looks nice, internal sun visor is amazing, air flow is spectacular, and the modular design is done well. Some cons: THIS HELMET IS LOUD. I have to ride with ear plugs and even then it's really loud around 70+mph. It seems most of the noise is from wind entering from the neck as well as from either side of the helmet where hinges for the modular helmet are. This helmet also feels a bit cheap but that is to be expected with the price point. It still feels like a solid helmet and i believe it will protect me in a crash. Overall the main drawback for me was wind noise, other than that I love the helmet. August 10, 2016
LOVE this helmet! Lighter than my last helmet, decent air flow, snug comfortable fit...looks sharp as well. Very happy with this purchase! August 4, 2016
Awesome helmet It's heavy @ 1st, but I got use to it. Has little pockets for head phones (i can't use ear buds) tons of vents, it's 100degrees here & I'm not ringing wet when I take it off. Very well padded. Light on back is great, especially when my tail light went out 1 night. The view is unbelievable, great on side vision, like I don't hav a helmet on. Love the adjustable sun shade inside. I'm not easy on my helmet & it's holding up great. I feel so safe w/this helmet. Wish had gotten sooner. July 30, 2016
You get what you pay for It is what it is. Its a loud, mediocre helmet. In the month I have had it I have already had the two front vent covers fall off. The Wind noise is awful at speeds above 35, and even with all the v vents open I sweat like a pig. That being said, for the price, considering it is a modular helmet with integral sunshade and rear light, its a trade off. The modular chin guard is great, super easy to get the helmet on and off and nice to cool off/talk at stop lights. The red flasher is helpful as well at night, as well as the neon yellow actually working very well. Apart from the sweat, the helmet is very comfortable on my head. I never feel constricted or heavy. Granted Im a strong and large guy so its not too burdensome to wear it. All in all, I will not be buying this brand again for the reason of air flow and noise level. I would much rather have a quieter helmet with a cooler head than a modular one. For a cheap first helmet it definitely did the job I expected, but next time Im going to go the extra $100 and get something better July 23, 2016
Disappointed We bought three of these helmets (one for me, one for my hubby and one for my 17yo daughter). I love all the features this helmet has but the drawbacks are significant. The helmet is very heavy (4.5 pounds) resulting in a sore neck every time I wear it for distance rides. Holding my head up in windy conditions is a chore. I've only had mine for a couple months and the two plastic pieces that slide the sun visor up and down blew off while going down the road. I have a fairly narrow face but the cheek pads squeeze so tightly that my upper jaw is in misery after a couple hours. A larger size may fix that problem but then the rest of the helmet would be too big. My husband actually has dents in his head from the weight of the helmet after a day of riding. My daughter hasn't worn hers much. Hopefully hers will be better. We've already replaced mine and my husband's with something else. July 19, 2016
helmet is all that Revzilla says that it is. I took the Gmax gm54s out for its first spin this weekend. The fit felt very secure and comfortably snug. I like the ease of operating both visors. The Sun Shade visor is great with the only exception that I find that it distorts my vision slightly with my prescription glasses. I will probably restrict my use of that only to those times when the sun is in my face. I find that the noise level is pretty quiet and airflow seems good. It is really nice to put on a helmut with a pristine visor. Guess that will not last for ever but was not overlooked or unappreciated. Color is great: almost a rock solid match for the moto guzzi metallic grey. Very pleased in Virginia July 19, 2016
my first modular is a success! coming from a 3/4 helmet, I was concerned about vision and feeling closed in. Every full face helmet I tried on previously made me feel like I was in a prison. I liked the concept of modular but knew I wouldn't be riding down the highway with it open so I didn't know how this would all come together. I "chatted" with a Revzilla rep (I think it was Phil) and he discussed the helmet with me even down to sizing...He didn't guide me wrong. I have had the helmet a little less than a month and after about 800 miles, I know I made a good choice. The only issue is I ran into rain a few days ago and the shield fogged up immediately. Hopefully the dual lense shield will remedy that issue. Other than that it has been a great product for me so far. May 24, 2016
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