A derailleur shifting system comprise a front derailleur, a rear derailleur, an operating device and a controller. The front derailleur is configured to be controlled to shift among front gear positions. The rear derailleur is configured to be controlled to shift among rear gear positions. The operating device is configured to generate an operational instruction associated with one or both of the front derailleur and the rear derailleur. The controller is configured to control one or both of the front derailleur and the rear derailleur to shift according to the operational instruction, an estimated gear position table and a gear position control table. The estimated gear position table comprises an estimated front gear position of the front derailleur and an estimated rear gear position of the rear derailleur, and the gear position control table comprises matching relationships between the front gear positions and the rear gear positions.

A derailleur shifting system comprise a front derailleur, a rear derailleur, an operating device and a controller. The front derailleur is configured to be controlled to shift among front gear positions. The rear derailleur is configured to be controlled to shift among rear gear positions. The operating device is configured to generate an operational instruction associated with one or both of the front derailleur and the rear derailleur. The controller is configured to control one or both of the front derailleur and the rear derailleur to shift according to the operational instruction, an estimated gear position table and a gear position control table. The estimated gear position table comprises an estimated front gear position of the front derailleur and an estimated rear gear position of the rear derailleur, and the gear position control table comprises matching relationships between the front gear positions and the rear gear positions.

The disclosure refers to a hub for a bicycle running wheel, a bicycle drive system and a bicycle. In an embodiment a hub for a bicycle running wheel includes a hub body and a receiving area configured to receive a force transmission means, wherein the hub body and the receiving area are a single part or are firmly connected together.

A wire control device having high structural strength, which is disposed on a handlebar of a bicycle, includes a main body, a bearing and a handle assembly. The main body includes a bearing fixing seat having an annular inner wall. The bearing is disposed in the bearing fixing seat and includes inner and outer races. The outer race of the bearing is in contact with the annular inner wall of the bearing fixing seat. The handle assembly is rotatably disposed on the main body and has a rotary axle. The inner race of the bearing is sleeved onto and in contact with the rotary axle. By the above-described configuration design of the wire control device, the bearing is primarily installed on the bearing fixing seat of the main body, so the whole handle assembly doesn't need quite large volume, bringing the wire control device high structural strength.

A chain and an inner link plate for a bicycle chain having chain rollers is provided. A protrusion of the inner link plate in relation to the respectively assigned chain roller in a front lower longitudinal end region of an inner link plate outer periphery is reduced, in comparison to the protrusion in a front upper longitudinal end region and/or in a rear lower longitudinal end region of the inner link plate outer periphery.

A chain and an inner link plate for a bicycle chain having chain rollers is provided. A protrusion of the inner link plate in relation to the respectively assigned chain roller in a front lower longitudinal end region of an inner link plate outer periphery is reduced, in comparison to the protrusion in a front upper longitudinal end region and/or in a rear lower longitudinal end region of the inner link plate outer periphery.

The present disclosure describes a gearshift mechanism for adjusting a gear ratio between a traction means, such as a chain, and a multi-sprocket gear set which can be rotated around an axle. The gearshift mechanism is configured to move the traction means in relation to the sprockets, such that an adjustment element is moved into the rolling motion of the traction means, thereby causing movement off of one sprocket and movement onto another sprocket.

The present disclosure describes a gearshift mechanism for adjusting a gear ratio between a traction means, such as a chain, and a multi-sprocket gear set which can be rotated around an axle. The gearshift mechanism is configured to move the traction means in relation to the sprockets, such that an adjustment element is moved into the rolling motion of the traction means, thereby causing movement off of one sprocket and movement onto another sprocket.

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.