Ratchet structure of a freewheel and a hub

A structure of a freewheel and a hub contains a hub (20) including a first ratchet(21) having a pair of first teeth (22), a central shaft (23), a screw section (24), and a freewheel set (80); the hub (20) including a first chainwheel disc assembly (30), a second chainwheel disc assembly (40), a plurality of chainwheel disks (50), and a screw (60); each chainwheel disc (50) including a through hole (51), a first groove (52), and a second groove (53), a first single sprocket (54); the first chainwheel disc assembly (30) includes an aperture (31), a recessed rim (32), a recess (33), a pair of notches (34), and a first double sprocket (35); wherein the second chainwheel disc assembly (40) includes an opening (41), a second single sprocket (45), a raised fringe (42), a second ratchet (43) and a pair of tooth (44), both of which are arranged on a front side of the raised fringe (42).