Bicycle chain drive

The bicycle chain transmission with a swingarm (42) of the rear wheel, said swingarm being attached off the pedalling centre (3), in said transmission the rear wheel centre (1) of the rear wheel consisting of a hub with internal gear changing. The free strand (22) of the chain (2) is in a certain place, with regard to the swingarm (42) structure, wound up over the setting−up pulley (6) joined to the skeleton (4) of the bicycle. By this any negligible change of tightening of the chain (20) is ensured during the swingarm (42) movement and the chain transmission is not fitted with any usual tightener on a foot (421) of the swingarm (42). Contingent minute change of the strain (2) tightening can be equalized by the setting−up pulley (6) itself which can be joined to the skeleton (4), e.g., by means of a spring−cushioned holder (43). In bicycles with very high position of the hanger (411) of the swingarm, the transmission pattern is completed by an inserted sprocket wheel (5) mounted on the inserted shaft (51) by means of which the traction strand (21) of the chain (2) is led to the proximity of the hanger (411). To the inserted shaft (51) an auxiliary drive unit (8) can be joined. The inserted shaft can be joined by means of threaded cups the pitch of which is 24 threads within British inch.