GMax GM54S Derk Modular Helmet

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GMax GM54S Modular Helmet

Rating: 10

(5 Reviews) Read Reviews

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List Price: $189.95
Sale Price: $138.95

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GMax GM54S Derk Modular Helmet

Item Code: GMaxGM54SDerk
Color:Derk Dark Silver Graphics
Shell:thermo-plastic alloy 
Certifications:DOT approved


  • 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.

Size Chart

Helmet Sizing Information.We ask that you use the following information to help choose the proper size helmet. In order for a helmet to protect properly and be the most comfortable, it must be size to your head correctly.

To find the Correct size helmet for a person's head:

  1. Measure the head circumference one-inch above the eyebrows and ears
  2. Using the circumference measured, use the size chart below to find the approximate size
  3. Once you have tried on the helmet it should fell snug equally around the head. The helmet should not feel too tight or too loose at any point around head.

*** Please remember that all head shapes vary slightly and that this sizing chart is to be used as a starting guide, not an exact guide.

Metric cm Inches Letter Number
53 - 54cm 21-1/4" - 21-5/8" XS 6-3/4 - 6-7/8
55 - 56cm 22" - 22-7/16" S 7 - 7-1/8
57 - 58cm 22-13/16" - 23-1/4" M 7-1/4 - 7-3/8
59 - 60cm 23-5/8" - 24" L 7-1/2 - 7-5/8
61 - 62cm 24-3/8" - 24-13/16" XL 7-3/4 - 7-7/8
63 - 64cm 25-3/16" - 25-5/8" XXL 8 - 8-1/8
65 - 66cm 26" - 26-3/8" XXXL 8-1/4 - 8-3/8
67 - 68cm 26-1/2" - 26-5/8" XXXXL  

Customer Reviews

Rated 10 out of 10 based on 5 reviews
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GMax GM54S Helmet

Comment: Got 1, ordering another for a passenger. Fits great works good. Love the sun shade. Opens easily with one hand. Finding vents takes some getting use to.


Cambridge, On. Canada

I Love My G-MAX

Comment: This helmet wasn't my first choice , my first choice was too small and the wind noise was terrible I have to admit that I was weary about ordering a helmet online but Jaffrum changed my mind after allowing me to exchange for this G-MAx helmet which is the best helmet that I have ever had. It's very comfortable ,the sunshield works flawlessly blocks out the sun with just the right amount of shading .also it is top quality After having my head slammed to the payment during a recent accident I have no head injury .I now need another helmet and won't think twice about ordering another one . Thanks JAFFRUM


Denver Colo.

Outstanding Helmet!!!GMax GM54S Derk

Comment: This is an amazing fitting helmet and the integrated brake light gets a lot of notice!!! Fast shipment and very nice website... Will be ordering more gear from!!



GM54S Derk Helmet Review

Comment: Have had my GM54S Derk for 2+ weeks now and absolutely love it. Its a bit heavier than my last GMAX but well worth it. Comfort and fit are fantastic. Sun shade it the best. easy to use and is great for me as i wear glasses. My only negative comment would be that the inner face pads are a bit too large (35MM) standard on the size medium helmet) and there are no reliefs to accept the arms of my prescription glasses.

Scott Conrad


GMax GM54S Derk Helmet Review

Comment: By writing in detail about your product you are helping your biker buddies make better choices. Thank you.

Scott Conrad


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Browse 1 question and 2 answers
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what other colors are offered? I am looking for wine colored
A shopper on Apr 25, 2015
Best Answer: This helmet only came in one color.
It's great helmet. Very comfortable
Reply · Report · Ray G on Apr 25, 2015
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