BC wheel is a frameless unicycle and is the most basic type of unicycle, consisting of a single wheel and footpegs that hang from the axle. 
It can seem impossible to drive and that's why it is also called impossible wheel! 
But with a little practice it is not that difficult and it is extremely pleasant to acquire new balances.
The footpegs being curved bring the center of gravity lower and this makes it easier to drive than simple pegs in line with the axis.
You get on the wheel by jumping while it's in motion or by putting one foot on a plate and pushing like a skateboard.
Tricks are possible, such as hopping, drops, grinds, and spins.

BC platforms: Surface 15 cm, thickness 6 mm, black color with laser engraved Nimbus logo.
Footplate adjustments in 3 positions: 45, 65 and 85 mm from the center of the axle to the footplate.