Log In / Register
0 Checkout
Gmax GM48 Derk Helmet
  • Gmax GM48 Derk Helmet - Black/Silver
  • Gmax GM48 Derk Helmet - Matte Black/Silver

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

Select Color:

183 10593

Select Size:

Size Chart
Savings (20%):

Select qty:

Please select a Color and Size to view availability.
Add to Wish List

Related Video

Gmax GM48 Derk Helmet Videos

Gmax GM48 Derk Helmet


  • Platinum Series includes platinum tint shield and deluxe helmet bag with shield pocket.
  • High tech shell design for maximum venting and comfort.
  • D.E.V.S Dual Exhaust Venting System allows control of air flow for maximum comfort through two side vents, three top vents, and two rear vents.
  • CoolMax comfort liner and cheek pads moves moisture away from the body and dries quickly.
  • Removable, washable interior.
  • Padded chin strap.
  • Large eyeport opening for greater visibility.
  • Removable, adjustable cheek pads allow custom fitting and increased comfort.
  • Hard coated shield reduces scratching.
  • Aerodynamic flush mounted, screwless shield is easily removed.
  • Speaker pockets for easy speaker/communication system installation.

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
Black/Silver / LG 270958 NG148996 TC-12 Out of Stock
Black/Silver / MD 270957 NG148995 TC-12 Out of Stock
Black/Silver / SM 270954 NG148994 TC-12 Out of Stock
Black/Silver / XL 270959 NG148997 TC-12 Out of Stock
Black/Silver / XS 270956 G148993 TC-12 In Stock: Ships next business day
Black/Silver / 2XL 270955 NG148998 TC-12 Out of Stock
Matte Black/Silver / LG 270961 NG148396 F.TC-12 Out of Stock
Matte Black/Silver / MD 270962 NG148395 F.TC-12 Out of Stock
Matte Black/Silver / SM 270965 NG148394 F.TC-12 Out of Stock
Matte Black/Silver / XL 270964 NG148397 F.TC-12 Out of Stock
Matte Black/Silver / XS 270963 G148393 F.TC-12 In Stock: Ships next business day
Matte Black/Silver / 2XL 270960 NG148398 F.TC-12 Out of Stock


Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

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 GM48 Derk Helmet 4.3 5 7 7
Just what I was looking for. I was looking for a helmet to wear in the winter to protect my face from the cold and wind. This helmet is perfect, it made my winter rides to work more bearable. April 19, 2016
Nice Helmet Fits is good, quality is good and it's comfortable. Wish it came in a few other color options but for the price no big deal. Shield change isn't super easy, getting it off is OK, getting the new one on is a bit difficult but I don't plan on changing them often. Overall great helmet for the money. October 8, 2014
Great helmet! This helmet was a great buy at a great price. Add in the free, fast shipping for a wonderful online shopping experience. I like the feel of the helmet as well as the weight. Riding for long periods can feel as though you don't have anything on your head. I looked at other helmets that were much more expensive that didn't offer much more than the gmax48s. The platinum series also comes with a tinted shield at no other cost... this was a major buying point for me. August 11, 2014
Good for the money Fits tight but comfortable. A little noisy thru the visor. Good buy for the price. January 20, 2014
Great helmet This is my third helmet and Ive got to say its the most comfortable I have owened. Ive been using it for four months now and it still feels great, and now that its starting to get cold its actually been keeping my face warm. Its a great helmet and I would recommend it to anyone! November 3, 2011
this is a great product for a great price good prices good products and it came with an extra dark shield it saved me a few more dollars. April 11, 2011
Gmax48 Street Helmet I ware a large but this one I went to a medium. It is a bit tight taking on and off and you need to adjust the ear cups but after that it fits pretty good. Wind noise is not bad and the view is great! The tinted visor is a plus and looks good! I also have a KBC that fits a little better. Overall I like the Gmax line. March 31, 2009
1-7 of 7
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 GM48 Derk Helmet? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.