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Fit Guide

Designed with key crossover technologies from our award-winning moto helmets, the Full-9 sets the standard for Downhill and BMX riding.

  • XL/XXL
  • XS/S
  • M
  • L
Size Chart & Fit Guide
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No other helmet manufacturer has deeper roots in motocross. Much of what Bell engineers learned from creating the award-winning Moto-9 helmet went into the Full-9 full-face mountain bike helmet. Take that unrivaled experience, combine it with feedback from downhill and BMX pros, and you have the winning formula. The Full-9 meets the most stringent ASTM Downhill Mountain Bike Racing standard as well as CPSC and CE bicycle safety benchmarks. Additional motocross trickle-down technologies include the Eject Helmet Removal System and magnetic cheekpads. Beyond that, the Full-9 includes features like Soundtrax built-in speaker pockets and audio cable routing, and an integrated breakaway camera mount. Add in a lightweight carbon shell, a wide field of view, Overbrow Ventilation intakes and Velocity Flow Ventilation and you have the world’s most advanced helmet for DH or BMX.


  • Breakaway Screws
  • Flying Bridge Visor™
  • Integrated Breakaway Camera Mount
  • Integrated Eject® Compatibility
  • Integrated/Removable Camera Mount
  • Lightweight Full Carbon Shell
  • Magnefusion Emergency Release System (MERS)
  • Magnefusion™ Removable Magnetic Cheekpads
  • Overbrow Ventilation™
  • Padded Chin Strap with D-Ring Closure
  • Soundtrax™ Speaker System
  • Velocity Flow Ventilation™
  • XT-2® Extended Wear Interior



1130 Grams


10 vents, 3 brow ports


  • ASTM F1952-00
  • ASTM F2032 (BMX)
  • CE EN1078
  • CPSC Bicycle

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Big Crashes Need Quality Helmets Mike B

Let me first say, I love the Full 9. It is a massive improvement from my previous helmet and is ridiculously light. The field of view is amazing. I took a hard crash 2 days ago on a Single Black jump line and landed head first. I was concussed, but not nearly as bad as I should have been for how hard I hit. Only complaints are that the matte finish scratches easily and the cheek pads can squeak.

Far better than a D3 Morris

I love my full-9! My friend has a d3 and my full-9 is way more comfortable. I also like the moto style that it has. I took a gnarly crash in whistler ( when I got up the first thing I did was take my helmet off and check for scratches. There were a couple but they rubbed off. I was really surprised by how well it held up. I thought the visor was going to break off but it didn't. My point is if you are going to fork over $450 for a helmet bell is the way to go.

Security Alex

I've raced DH for quite some time and the Full 9 is the first bicycle helmet I've felt confident in wearing. It's light but shows off it's moto roots for sure.

Bell Full-9 Review Chris BMX/MTB/MOTO

Rode for the first time in my new Full-9 yesterday and what a great helmet! Super light weight, great ventilation, and an excellent fit. The large was spot on based off of the size chart. I have used a Moto 8/9 on the dirtbike for years and have been very impressed with all of my Bell helmets. Thanks for making a great product as always

Protection Justice Khan

This item saved my live. I flew from about 25ft to my head. The helmet took the just of the fall but I will only ride bell helmets for downhill. Thank you for sponsoring our team.

Best on the market Brian

The helmet is great. What you get for the price is worth it. It has safety unlike no other helmet.

Great Protection Clinton

Took a nasty face first spill into rocks and walked away unscathed. My las thought before my crash was "My face is going to be messed up," but that was not at all the case. Great fit and good looks too. Looking forward to using the Soundtrax.

Bell Full-9 Mark Harris, Team Aston Hill

We've been running the Full-9 for the past year and the whole team absolutely love this lid, real comfortable and light for all day racing and so confidence inspiring, it helps them push themselves to the limit knowing that they have maximum protection.
Can't recommend enough!

Great fit Rob

Been riding a few days at Northstar DH park with my new helmet. The fit is great and the field of vision is way better then my previous favorite helmet. Great air flow too.

Unparalleled Craftsmanship Todd

The helmet has a fit which is as if you were born with it. So natural you don't even notice it on your head. Venting system which you can feel running over your scalp. You just feel secure in this helmet, from the moment you put it on until you go to get in your car and forget it's on your head. The finest Downhill helmet I've ever worn.

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