GMax GM55S Derk 2 Half Helmet

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GMax GM55S Derk 2 Half Helmet

Rating: 8

(8 Reviews) Read Reviews

List Price: $79.95
Sale Price: $49.95

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About the GMax GM55S Derk 2 Half Helmet

GMAX leads the helmet industry with another innovative helmet, the 55 half helmet with retractable sun shield, lightweight small shell design that sits down on your head and GMAX industry leading "No Bull Venting Design" all for a reasonable price! 

Item Code: GMaxGM55SDerk2
Color:Derk 2 Graphics
Standards Meet:DOT certified

GMax GM55S Derk 2 Half Helmet Features

  • Retractable hard coated sun shield, changeable, simple no springs design
  • Premium venting reduces heat at the top of the head. Comfort liner, shell and styro designed for maximum venting without reducing the integrity of the helmet
  • Coolmax performance materials and Chitosan anti-bacterial materials improve comfort and safety
  • Removable washable comfort liner
  • GMAX premium fit for maximum comfort
  • Included with removable snap in rear neck curtain for cool weather riding
  • Premium soft materials used for padded chin strap covering
  • Always do chin strap up securely

Size Chart for the GMax GM55S Derk 2 Half Helmet

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 8 out of 10 based on 8 reviews
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Very nice and affordable helmet

Comment: As an alternate to my full-face helmet, I was looking for something a little more open and airy. I found this Gmax helmet which includes the flip-down sun visor. Very nice for those glaring days out on the open road. The padded ear and neck attachment recently came in handy on a long trip that had lots of wind. This attachment worked great. Recommended buy!



Nice fit great helmet

Comment: Fast delivery. No problems with order, product was what I expected. Great for hot days when I was tempted to go without head protection. Built in visor is perfect



Better Than Expected

Comment: The helmet fits well, rides well and looks good. I wear glasses and the sun screen works perfectly with them. I wear earplugs when I ride so the wind noise -- which is loud -- is tolerable. This is a fine warm weather helmet.

Phillip W. Hoffman

Pensacola, FL

Gmax GM55S Derk2 Helmet

Comment: The helmet was delivered fast and customer service at Jafrum was easy to get a hold of with any questions. I went by the sizing chart and when my helmet arrived it was too large, and moved around on my head too much. I returned it for the next smaller size which fit better. The return process was easy and I received a refund on my first helmet promptly. The helmet was priced competitively, and was a bargain compared to other websites and catalogues selling exactly the same helmet. I do not use the sun shield when I ride; because , it is too small and needs to be an inch or two lower to be more functional. The shield however is nice to have as back up eye protection in case of an emergency. The helmet looks good and is well made. I would buy another Gmax helmet, and would recommend it to my friends who are in the market to buy one.


Carlisle, PA

GMAX GM55S Derk 2 Helmet Review

Comment: A nice alternative on those sunny hot days when my full helmet is to warm also the pull down shade works well,If this one wears out I would buy another.



GMax GM55S Derk2 Helmet Review

Comment: An all around great helmet for warm weather riding. You can't beat the price. I searched around and nobody beat jafrum's pricing. The helmet is light and the flip down visor works nice with goggles or glasses. The only negative is that the visor does not work well on its own as it lets too much air in.


Carlisle, PA

GMax GM55 Derk2 Helmet Review

Comment: Style & fit are perfect. However, I would have liked the chin strap to be a click & release strap. Otherwise, I love it.


New York

GMax GM55S Derk2 Helmet Review

Comment: quick shipping helmet fit well. looks sharp. would buy another one

terry johnston


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