Abstract: A pedal crank drive having a pedal crank (12) and a chain ring (14), which can be connected to each other in a rotationally fixed manner to form a unit (10), the unit (10) having a spindle hole (16) for a bottom bracket spindle. The chain ring (14) has a first connecting contour (18) and the pedal crank (12) has a second connecting contour (20), wherein the connecting contours (18, 20) can be fitted into one another in an assembly position, and the pedal crank (12) and the chain ring (14) can be rotated relative to one another around the spindle hole (16) to a stop position in which the stop surfaces (22, 24) of the pedal crank (12) and the chain ring (14) abut against each other.

Abstract: A drive chain system having a chain with an alternating succession of inner chain links and outer chain links, each inner chain link having a pair of inner link plates contacting the lateral faces of two rollers and each outer chain link having a pair of two outer link plates contacting the inner link plates of adjacent inner chain links. A pin connects two outer link plates and two inner link plates and a roller, wherein the inner surfaces of a pair of opposite outer link plates has protrusions in the area between the adjacent inner link plates. The system has a chainring with a plurality of teeth, which teeth taper laterally towards their respective tip.

Abstract: A chain comprising an alternating succession of inner chain links and outer chain links, each inner chain link having a pair of inner link plates contacting the lateral faces of two rollers and each outer chain link having a pair of two outer link plates contacting the inner link plates of adjacent inner chain links. A pin connects two outer link plates and two inner link plates and a roller, wherein the inner surfaces of a pair of opposite outer link plates comprise protrusions in the area between the adjacent inner link plates. The circumference and/or diameter of the protrusion is at least 60% and/or maximum 140% the circumference and/or diameter of the eyes of the outer link plate.

Abstract: A drive chain system having a chain with an alternating succession of inner chain links and outer chain links, each inner chain link having a pair of inner link plates and each outer chain link having a pair of two outer link plates contacting the inner link plates of adjacent inner chain links. A pin connects two outer link plates and two inner link plates, wherein the inner surfaces of a pair of opposite outer link plates has protrusions in the area between the adjacent inner link plates. The system has a rear cassette with a multitude of sprockets with a plurality of sprocket teeth, wherein the cassette has sprocket teeth of different tooth types, the teeth of at least one tooth type having a tip laterally offset from the centerplane.

Abstract: A sprocket for engagement with a drive chain has a plurality of teeth extending radially from a periphery of the sprocket, including a first and a second group of teeth; the teeth of the first group and the second group are alternately arranged so that each tooth of the first group is followed by a tooth of the second group, and vice versa; each tooth of the first group having a first maximum width, each tooth of the second group having a second maximum width which is larger than the first maximum width; each tooth of the second group has a protrusion on at least one lateral face of the tooth; the outer lateral face of the protrusion extends over a first portion of the lateral face of each tooth of the second group, the length being 50% of the length of the respective tooth or less.

Abstract: A sprocket for engagement with a drive chain has a first and a second group of teeth, wherein the teeth of the first group and the second group are alternately arranged and each tooth of the second group is wider than each tooth of the first group. The profile of each tooth of the second group has a first protrusion in the front half of the tooth on a first lateral surface and a second protrusion in the rear half of the tooth on a second, opposite lateral surface of the tooth. In particular, the portion of each tooth of the second group engaging the chain may have a center plane that is rotated or twisted during forming about the radial center line of the tooth with respect to the central plane of the sprocket.

Abstract: A sprocket for engagement with a drive chain has a plurality of teeth extending radially from a periphery of the sprocket, including a first and a second group of teeth; the teeth of the first group and the second group are alternately arranged so that each tooth of the first group is followed by a tooth of the second group, and vice versa; each tooth of the first group having a first maximum width, each tooth of the second group having a second maximum width which is larger than the first maximum width; each tooth of the second group has a protrusion on at least one lateral face of the tooth; the outer lateral face of the protrusion extends over a first portion of the lateral face of each tooth of the second group, the length being 50% of the length of the respective tooth or less.

Abstract: The present patent application describes a modular crankset for bicycles. The described modular crankset is useful for users, since it solves issues related to the speed of replacement of elements, the easiness of the replacement procedures and lowers the weight of the set without compromising the consistency and rigidity of the set. The current technology is applicable to any bicycle available in the market, including electrical bicycles, and it is especially interesting for competition bicycles, wherein the replacement of the constituent elements of the crankset should be made as quickly as possible.

Abstract: The present application describes a transmission system, including a certain tooth profile of toothed wheel and its use. This transmission system enables an improved guidance of the chain by using a non-normative tooth profile, to avoid that when the vehicle is exposed to extreme situations disengagements of the chain may occur. This transmission system applies to vehicles, preferably bicycles.

Abstract: A cover for the sprocket (5) of a bicycle or electric bicycle consists of a cover plate (9) which is arranged between the chain wheel (5) and the equilateral crank (2) and fastened without screws on the inside of the crank.

Abstract: The present application describes a chain guard system lock nut comprising an electric motor (7) wherein the sprocket rotates at an angular speed different from the crank speed (2). The present application discloses a bike chain guard system lock nut designed to protect the clothing of the user from fouling or being caught between the chain and the sprocket, thereby avoiding accidents, but also, and by means of the chain guard (4), avoiding the chain from releasing from the sprocket in the bottom bracket (8). This lock nut is assembled together with the sprocket directly on the bottom bracket.