To provide the bicycle whose wheels and the like can be easily and quickly mounted to/demounted from a bicycle main body.

One way clutching means 64 to be interposed between a driven rotating member 44 receiving the driving force of a pedal crank by way of a belt and a wheel, includes both a driving clutch portion 74 to be combined with the driven rotating member and a driven clutch portion 76. It is so constituted that the assembly of the wheel with a bicycle main body allows the driven rotating portion and the driving clutch portion to be in an operating condition, and the disassembly of the wheel out of the bicycle main body allows the driven clutch portion and the driving clutch portion to be mutually separated. And a means is also provided, which can easily and quickly mount/demount cables and the like.