GMax OF77 Downey Helmet


The OF77 has a kitten-soft interior with a large face shield which lets you see everything around you.

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GMax OF77 Downey Helmet

The GMax OF77 Helmet is based off of the very successful GM67. It features the Spa Soft and CoolMax interior and multi-density cheek pads. The OF77 is like having two helmets in one. It offers the comfort of an open helmet, plus it quickly and easily converts to a full face helmet for those looking for increased protection and comfort with the installation of the optional jaw piece.


  • Lightweight DOT approved Thermo-Plastic Alloy shell
  • Anti-fog coated inner sun shield easily raised or lowered with a lever located on the exterior of the helmet
  • Cheek pads feature a multi-density foam construction creating a superior fit
  • Optional removable jaw piece (sold separately)
  • SPC top front vents/interior and styro designed for a controlled air flow
  • DEVS 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.
  • Large eye port for improved peripheral and range of vision
  • Spa Soft, CoolMax comfort liner and cheek pads move the moisture away from your body and the fabric dried quickly
  • Removable/washable interior and adjustable cheek pads allow for more comfortable sizing
  • Deluxe ear pockets with built in space for speakers for use of communication systems
  • Soft padded chin strap
  • Helmet bag included
  • Optional LED brake light kit (sold separately)


Matte Black/Pink / XS 1309276 G3774403 Out of Stock
Matte Black/Pink / SM 1309277 G3774404 Out of Stock
Matte Black/Pink / MD 1309278 G3774405 Out of Stock
Matte Black/Pink / LG 1309279 G3774406 Out of Stock
Matte Black/Pink / XL 1309280 G3774407 Out of Stock
XS / Matte Grey/Orange 1309269 G3774273 Only 1 Left: Ships next business day
SM / Matte Grey/Orange 1309270 G3774274 Out of Stock
MD / Matte Grey/Orange 1309271 G3774275 Out of Stock
LG / Matte Grey/Orange 1309272 G3774276 Out of Stock
XL / Matte Grey/Orange 1309273 G3774277 Out of Stock
2XL / Matte Grey/Orange 1309274 G3774278 Out of Stock
3XL / Matte Grey/Orange 1309275 G3774279 Out of Stock
XS / Matte Grey/Silver 1309262 G3774023 In Stock: Ships within 24 hours
SM / Matte Grey/Silver 1309263 G3774024 Out of Stock
MD / Matte Grey/Silver 1309264 G3774025 Out of Stock
LG / Matte Grey/Silver 1309265 G3774026 Out of Stock
XL / Matte Grey/Silver 1309266 G3774027 Out of Stock
2XL / Matte Grey/Silver 1309267 G3774028 Out of Stock
3XL / Matte Grey/Silver 1309268 G3774029 Out of Stock


GMax Helmet Sizing

For riders falling between sizes, we recommend sizing down.

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.

Additional information


Matte Black/Pink, Matte Grey/Orange, Matte Grey/Silver


XS, SM, MD, LG, XL, 2XL, 3XL


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Please reference our International Shipping Policy for details.


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U-Bike will match any advertised price on new merchandise available through another authorized U.S. dealer.


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Return any unused item within 90 days for a full refund.