OF-17 Helmet
The GMAX® OF-17 offers many of the features of our premium open face helmets at a price to fit any budget. You also have the option of running it with... Read More
The GMAX® OF-17 offers many of the features of our premium open face helmets at a price to fit any budget. You also have the option of running it with a sun visor for around town or for those days win you just want to feel the wind on your face.
Features
- DOT Approved
- Removable, adjustable and washable interior keeps you dry and comfortable. COOLMAX® CORE Technology wicks moisture away from your body and dries quickly
- 100% UV400 resistant face shield comes anti-scratched hard coated for a longer lasting clear view
- Speaker pockets for easy communication system installation
- Optional outer flip tint lens
- Optional peak visor
- Intercom Compatible
How to measure
Measure the circumference of your head one inch above the eyebrows and across the largest portion of the back of the head, then find the matching range. The crown should apply snug, even pressure and cheek pads should be snug (they break in with use). If the helmet moves on your head it is too loose; if it causes pain it is too small. If between sizes, size down.
GMAX size chart
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YL / XS | 53-54 | 20 7/8 - 21 1/4 |
| S | 55-56 | 21 5/8 - 22 |
| M | 57-58 | 22 7/16 - 22 13/16 |
| L | 59-60 | 23 1/4 - 23 5/8 |
| XL | 61-62 | 24 - 24 3/8 |
| 2XL | 63-64 | 24 13/16 - 25 |
| 3XL | 65-66 | 25 5/8 - 26 |
| 4XL | 67-68 | 26 3/8 - 26 3/4 |
Youth sizes
| Size | Head circumference (cm) | Head circumference (inches) |
|---|---|---|
| YS | 49-50 | 19 5/16 - 19 11/16 |
| YM (= XXS) | 51-52 | 20 1/16 - 20 7/16 |
| YL (= XS) | 53-54 | 20 7/8 - 21 1/4 |
One universal GMAX chart covers the whole lineup (street, dual-sport, snow). Youth and adult small sizes share shells and are dual-labeled: a Youth Large is the same fit as an adult XS.
Manufacturer sizing data · verified July 8, 2026