This is the magic of the ratchet and pawl mechanism. Inside the hub, there is a gear with sloped teeth (the ratchet) and spring-loaded levers (the pawls).When you stop pedaling, the wheel spins faster than your pedals. The pawls simply slide over the sloped back of the gear teeth, creating that iconic clicking sound while letting the wheel spin freely. But the split second you start pedaling, the pawls drop into the flat edge of the teeth, locking the mechanisms together and transferring 100% of