This nifty bike features a circular frame, which allows it to fold up nicely when not in use. Other features include a disc brake (front), clamshell brake (rear), Shimano Nexus system, and a belt system. No word yet on if this concept will go into production.
Both wheels have overhung mounting. After releasing safety lock nuts wheels can be turned around relevant axis into the frame. Because of folding of the rear wheel momentum transfer from crankset to rear wheel must be divisible