Abstract: A mono- or twin-rail overhead chain conveyor 10', 12' useful for transporting heavy loads such as motor vehicle parts wherein the conveyor has a chain track (14) in the form of an I-shaped profile with running gear 18,20 which can move along said track and has roller blocks 26,28 for mounting rollers 30,32 which are supported on the chain track, the roller blocks being connected to a traction means 42 for pulling the running gear and for a monorail overhead chain conveyor, the running gear is in the form of a loading running gear and for a twin-rail overhead chain conveyor, it is in the form of towing running gear which interacts with loading running gear 82 movable on a load rail 78 running below the chain track and to render wear-free, silent running possible, the traction means 42 is a rubber or plastic belt having a single-stranded metal, glass fiber or carbon fiber insert 46.