A sprocket support body is rotatably mounted on a hub axle of a bicycle rear hub assembly. The sprocket support body comprises at least ten external spline teeth configured to engage with a bicycle rear sprocket assembly. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface.

A bicycle rear sprocket assembly comprises at least one sprocket and an internal cavity. The at least one sprocket includes at least ten internal spline teeth configured to engage with a bicycle hub assembly. The at least ten internal spline teeth have an internal-spline major diameter. The internal cavity has a maximum outer diameter larger than the internal-spline major diameter.

A bicycle rear sprocket assembly comprises at least one sprocket and an internal cavity. The at least one sprocket includes at least ten internal spline teeth configured to engage with a bicycle hub assembly. The at least ten internal spline teeth have an internal-spline major diameter. The internal cavity has a maximum outer diameter larger than the internal-spline major diameter.

A bicycle has a spider including a torque input section and at least one torque output section; a crank assembly coupled with the spider through the torque input section and applying an input torque to the spider; a chainring mounted to the spider through the at least one torque output section and receiving an output torque from the spider; a gauge disposed and oriented generally along a tangential direction or a quasi-tangential direction with respect to the torque input section and the at least one torque output section; and a circuitry coupled to the gauge and receiving a signal from the gauge.

A multi-sprocket arrangement for a rear wheel assembly for a bicycle with a derailleur system is provided. The multi-sprocket arrangement has an axis of rotation and is designed for coupling, for conjoint rotation, to a driver of the rear wheel assembly. The multi-sprocket arrangement comprises at least eleven sprockets with differing numbers of teeth. Each sprocket has an inner side surface and an outer side surface in the region of its teeth and a sprocket center plane lying between the inner side surface and the outer side surface and running orthogonally with respect to the axis of rotation. The multi-sprocket arrangement is designed in such a manner that, in the mounted state, at least two sprockets with the smallest numbers of teeth are formed in a radially self-supporting manner and are coupled to the driver via at least one further sprocket with a greater number of teeth, and the three sprockets with the smallest numbers of teeth are arranged in such a manner that the sprocket center plane of the sprocket with the third smallest number of teeth of the multi-sprocket arrangement runs in the region of an axial end surface of the driver or axially outside the driver.

A multi-sprocket assembly for a rear wheel assembly for a bicycle with a derailleur system, comprising a multi-sprocket arrangement and a locking screw arrangement. The multi-sprocket arrangement is configured to be couplable to a driver of the rear wheel assembly in a torque-transmitting manner and comprises at least eleven sprockets with differing numbers of teeth. The multi-sprocket assembly is configured such that, in the mounted state, at least two of the smallest sprockets are axially fixed to the driver via the locking screw arrangement. The locking screw arrangement has a shaft portion for receiving at least one sprocket of the at least two smallest sprockets. The shaft portion has an axially outer stop portion at one end region and at least one external thread at an opposite end region. The at least one external thread configured to be screwed into an associated internal thread to fix the locking screw arrangement. The external thread of the shaft portion has an outer diameter which is larger than an outer diameter of a region of the shaft portion that receives the at least one sprocket of the at least two smallest sprockets.

A bicycle sprocket assembly comprises a first sprocket and a second sprocket. The first sprocket includes a plurality of first sprocket teeth, a first sprocket inward surface, a first sprocket outward surface, and an axial space. The second sprocket includes a plurality of second sprocket teeth, a second sprocket inward surface, and a second sprocket outward surface. The axial space is defined between the first sprocket outward surface and an axially inward outer link plate in the axial direction while the second sprocket outward surface contacts an axially outward inner link plate in an engagement state where the one of the plurality of the second sprocket teeth is positioned between an axially inward inner link plate and the axially outward inner link plate in the axial direction. The axial space is larger than 0 mm and equal to or smaller than 0.15 mm.

A bicycle control device includes an electronic controller that controls a motor to assist propulsion of a bicycle. The electronic controller is configured to decrease an output of the motor upon determining that a shifting device is performing a shifting action to change a transmission ratio of the bicycle. The electronic controller is further configured to end the control that decreases the output of the motor before a predetermined period elapses upon determining that the shifting action is completed or the transmission ratio is changed before the predetermined period has elapsed. The electronic controller is further configured to end the control that decreases the output of the motor upon determining that the predetermined period has elapsed in a case where the shifting action or the change in the transmission ratio is uncompleted even though the predetermined period has elapsed.

A bicycle control device includes an electronic controller that controls a motor to assist propulsion of a bicycle. The electronic controller is configured to decrease an output of the motor upon determining that a shifting device is performing a shifting action to change a transmission ratio of the bicycle. The electronic controller is further configured to end the control that decreases the output of the motor before a predetermined period elapses upon determining that the shifting action is completed or the transmission ratio is changed before the predetermined period has elapsed. The electronic controller is further configured to end the control that decreases the output of the motor upon determining that the predetermined period has elapsed in a case where the shifting action or the change in the transmission ratio is uncompleted even though the predetermined period has elapsed.

A sprocket assembly (1) to be mounted on a driver body (4) of a bicycle wheel with a truncated cone shell (2) having a first opening (21) in its small base and a second opening (22) in its large base, both openings being coaxial with the central axis (10) of said shell; a plurality of toothed sprockets (20) having different numbers of teeth for engagement with a chain; an axial fixing member (23), a radial load transmission profile (24) and a toothed torque transmission profile (25); wherein the truncated cone shell (2), the toothed sprockets (20), the axial fixing member (23), the radial load transmission profile (24) and the toothed torque transmission profile (25) are configured in a single piece; being the axial fixing member (23), the radial load transmission profile (24) and the toothed torque transmission profile (25) all disposed towards the inside of the truncated cone shell (2).