A drive sprocket can include a plurality of teeth for meshing with a drive member to transmit rotary motion. The drive member can include a plurality of engagement pockets engaging the teeth of the drive sprocket, where each tooth has a tooth profile defined by a first side comprising a first engagement surface and an opposite second side comprising a second engagement surface, which engagement surfaces are configured such that when driven, a tooth meshes to the engagement pocket at a first contact location on the first engagement surface and also at a second contact location on the second engagement surface.

The present disclosure relates to a chain ring having teeth positioned in one of three lateral positions. At least one tooth may be placed in each lateral position. At least half the teeth may be positioned in a middle lateral position. The teeth in the first and third lateral positions may apply opposing lateral forces to a bicycle drive chain.

The present disclosure relates to a chain ring having teeth positioned in one of three lateral positions. At least one tooth may be placed in each lateral position. At least half the teeth may be positioned in a middle lateral position. The teeth in the first and third lateral positions may apply opposing lateral forces to a bicycle drive chain.

A chain for a bicycle, a sprocket cassette, a chainring, a crankset, a chain drive system, and a bicycle are provided. The chain comprises a plurality of interleaved link elements, each link element being pivotably attached to at least one other link element and comprising at least two teeth. A flank of each tooth is adapted to engage with a flank of a sprocket tooth. The sprocket cassette comprises one or more sprockets, each comprising a plurality of sprocket teeth, wherein each sprocket tooth has a flank with a profile corresponding to a profile of at least part of a tooth of each of the plurality of link elements. The chainring comprises a plurality of sprocket drive teeth having a profile corresponding to the profile of at least one of the teeth of each of the plurality of link elements.

An improvement to continuously variable transmissions whereby power is transmitted from a driver axle to a driven axle through a variable transmission mechanism. A plurality of unidirectional sprocket wheels positioned radially around a driver axle within a set of frustoconical members is provided so that the distance from the driver axle can be adjusted. The unidirectional sprocket wheels are connected by a chain to a similar driven axle portion. This low vibration, high torque capable transmission is superior to variable transmissions that rely on friction-based power transmissions that can slip during operation.

An improvement to continuously variable transmissions whereby power is transmitted from a driver axle to a driven axle through a variable transmission mechanism. A plurality of unidirectional sprocket wheels positioned radially around a driver axle within a set of frustoconical members is provided so that the distance from the driver axle can be adjusted. The unidirectional sprocket wheels are connected by a chain to a similar driven axle portion. This low vibration, high torque capable transmission is superior to variable transmissions that rely on friction-based power transmissions that can slip during operation.

A bicycle rear wheel adapter has an annular body that abuts a sprocket-carrying body that extends in an axially outer direction and receives sprockets in radially peripheral positions. A coupling element on the annular body couples with the sprocket-carrying body so the adapter rotates as a unit with the sprocket-carrying body, and a sprocket-receiving seat on the annular body couples with a sprocket so the adapter rotates as a unit with the sprocket. The adapter is suitable for cogsets with small sprockets grouped in a monolithic grouping.

A bicycle rear wheel adapter has an annular body that abuts a sprocket-carrying body that extends in an axially outer direction and receives sprockets in radially peripheral positions. A coupling element on the annular body couples with the sprocket-carrying body so the adapter rotates as a unit with the sprocket-carrying body, and a sprocket-receiving seat on the annular body couples with a sprocket so the adapter rotates as a unit with the sprocket. The adapter is suitable for cogsets with small sprockets grouped in a monolithic grouping.

A bicycle sprocket arrangement comprises a smaller sprocket and a larger sprocket. The larger sprocket has at least one upshifting facilitation area configured to facilitate an upshifting operation in which a bicycle chain is shifted from the larger sprocket toward the smaller sprocket. The at least one upshifting facilitation area includes an upstream tooth, an intermediate tooth, and a downstream tooth. The upstream tooth has a first recessed portion. The intermediate tooth has a second recessed portion. The downstream tooth has at least one of a third recessed portion and a chamfered portion. The at least one of the third recessed portion and the chamfered portion are separated from the second recessed portion.

A bicycle sprocket arrangement comprises a smaller sprocket and a larger sprocket. The larger sprocket has at least one upshifting facilitation area configured to facilitate an upshifting operation in which a bicycle chain is shifted from the larger sprocket toward the smaller sprocket. The at least one upshifting facilitation area includes an upstream tooth, an intermediate tooth, and a downstream tooth. The upstream tooth has a first recessed portion. The intermediate tooth has a second recessed portion. The downstream tooth has at least one of a third recessed portion and a chamfered portion. The at least one of the third recessed portion and the chamfered portion are separated from the second recessed portion.