FANGS™ 2.1 are for full-size Onewheels only, and are being replaced by the new and much more capable FANGS 3.0. 

Note that these will work on Onewheel+ and XR models. V1 is not supported.  THESE DO NOT FIT THE PINT OR THE UPCOMING GT.

Lose a square nut?  Get extras on Amazon by searching for "M6 square nut".

The features of FANGS 2.1 include:

• Injection-molded, glass-filled nylon for extreme durability
• NEW! Redesigned & improved precision urethane wheel
• Stainless steel mounting hardware
• Dual ball bearings on each wheel with an aluminum spacer
• No drilling of your frame or footpad - bolt on and go!

How do FANGS™ work?

FANGS™ reduce the friction of the nose on the ground, so when your Onewheel's front bumper meets pavement, it won't stop instantly and throw you off from the sudden deceleration. FANGS™ give you a precious few seconds to either jump off your board in a controlled manner, or possibly regain control and keep riding. They are meant for low to mid-speed nosedive mitigation ( <= 16mph), although skilled riders have ridden out much higher speeds (over 23mph). Proven to be effective by many riders, FANGS™ are now considered standard equipment for new board owners.

Like any performance product for Onewheel, using FANGS™ is a learned skill that takes practice to use correctly. Just as you don't expect to be an expert on your first day with your Onewheel, FANGS™ work best when you've experimented with them on your own for a while.

FANGS™ are especially great at helping go up steep inclines, because in this case when a nosedive occurs, the board is already very close to touching the nose down (due to the incline). Therefore the "fall" of the nose to ground is much shorter and much easier to control than on flat ground.

And it's fun to do things you can't do without nose wheels. Like Fang Drag starts!  Which are pretty much impossible without some sort of nose wheels.

Check this video for more info.

FANGS™ are an experimental product, and no guarantees are offered in terms of saving a rider from all nosedives. However, they have been proven to work time and again by many riders. The stories are all over the Facebook user groups. The only way to prevent nosedives is to not accelerate too hard for a given speed – thus, no product can "prevent" a nosedive. Gradual speed increases will result in less nosedive events, as will riding at moderate speeds.

Onewheel blogger James Chang created a great installation video.

Printed installation instructions are here.