A drive arrangement for a bicycle may include a plurality of sprockets arranged at a rear wheel of the bicycle. The sprockets may be particularly arranged to have a spacing that facilitates the configuration of an increasing number of sprockets in the plurality of sprockets. A singular front sprocket or chain ring may be used to drive the rear plurality of sprockets. The singular front chain ring may include first and second groups of teeth, the first group of teeth being wider than the second group of teeth. The drive arrangement may also include a rear derailleur. A chain having inner link plates with recesses may also be include in the drive arrangement.

A bicycle sprocket comprises a sprocket body and a plurality of sprocket teeth provided on an outer periphery of the sprocket body and including at least one first tooth and at least one second tooth. The at least one first tooth has a driving surface side and a non-driving surface side. The at least one first tooth has a bevel cut shape in the non-driving surface side. The bevel cut shape is configured to avoid initially engaging with a bicycle chain in a shifting operation where the bicycle chain shifts from an adjacent smaller bicycle sprocket to the bicycle sprocket. The at least one second tooth is configured to initially engage with the bicycle chain in the shifting operation. The at least one second tooth is disposed adjacent to the at least one first tooth in a circumferential direction with respect to a rotational center axis of the bicycle sprocket.

A chainring is disclosed. The chainring includes a plurality of teeth about the outer perimeter of the chainring; and a chain retention feature at a root of one or more of the plurality of teeth and traversing at least a portion of a circumference of the chainring, the chain retention feature to align with at least a portion of a roller chain and assist in a retention of the roller chain on the chainring.

A bicycle sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a first sprocket body, first sprocket teeth, and a first pitch circle. The first pitch circle has a first diameter. The second sprocket includes a second sprocket body, second sprocket teeth, and a second pitch circle. The first sprocket teeth include a large-sprocket downshifting tooth and an additional large-sprocket downshifting tooth. The second sprocket teeth include a first small-sprocket downshifting tooth, a second small-sprocket downshifting tooth, a first adjacent tooth, and a second adjacent tooth. A circumferential area is defined from a driving surface of the first adjacent tooth to a non-driving surface of the second adjacent tooth in a driving rotational direction about a rotational center axis when viewed in an axial direction. The large-sprocket downshifting tooth is disposed in the circumferential area when viewed in the axial direction.

A bicycle sprocket comprises a sprocket body, a sprocket ring, a plurality of limiting members, and a plurality of reinforcing members. The sprocket ring has a plurality of ring pieces, each of which includes a plurality of sprocket teeth. Through the movement of the sprocket ring relative to the sprocket body, the axially movable scope of the sprocket ring limited by the limiting members, and the binding strength between the adjacent ring pieces stabilized by the reinforcing members, the sprocket ring can shift relative to the sprocket body in order to reduce the friction and noise generated by the sprocket teeth of the ring pieces and the chain when the bicycle sprocket drives the chain to move.

The device for the motion transmission onto cycles comprises: a connecting core able to be associated with a frame of a cycle in a rotatable way around an axis of rotation; and a ring gear lying on a lying plane surrounding the core and able to be coupled to a flexible transmission element closed on itself in a loop for starting said cycle along a direction of forward movement; oscillation means placed between the connecting core and the ring gear and able to tilt the lying plane with respect to the axis of rotation.

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.

An individual chain wheel for a bicycle front crank arrangement for engaging in a drive chain includes a plurality of teeth formed on a circumference of the chain wheel and having a first and a second group of teeth. The teeth of the second group of teeth are arranged in an alternating manner between the teeth of the first group of teeth. Each tooth has a load flank via which force is transmitted between an adjacent roller of the drive chain and the respective tooth. Each tooth of the first group may also have at least one profile with an opening in the vicinity of the flank, in which a portion of an inner link plate of the drive chain, which portion protrudes beyond the roller, engages.

A toothed wheel assembly that has at least two toothed wheels. Each toothed wheel has a plurality of teeth separated from one another by corresponding troughs and the second toothed wheel has a greater number of teeth than the number of teeth of the first toothed wheel. A plurality of connection bodies connect the first and second toothed wheels axially and space them. Each connection body has a first connection portion that is connected to the second toothed wheel and extends radially from the second toothed wheel towards the first toothed wheel and a second connection portion connected to the first toothed wheel that extends axially from the first toothed wheel. The second connection portion of each connection body has a circumferential bulk the radial projection of which is completely contained in a trough of the first toothed wheel.

A bicycle front shifting system includes operable to transmit a wireless signal, a crank assembly with two crank arms and a pedal on each of the two crank arms. The crank assembly is rotatable about a rotation axis. A front shift unit is coupled to the crank assembly and is rotatable about the rotation axis. The front shift unit includes a chain ring component with a big chain ring and a small chain ring. The small chain ring has a small diameter and the big chain ring has a big diameter that is larger than the small diameter. A shift mechanism is coupled to and rotatable with the chain ring component about the rotation axis. The shift mechanism is configured to receive the wireless signal from the shifter and to shift a chain between the big chain ring and the small chain ring according to the wireless signal.