A rear wheel sprocket arrangement for a bicycle comprises a plurality of coaxially arranged sprockets having different numbers of teeth, wherein an entire gear range of the sprocket arrangement is at least three-hundred fifty percent (350%), and wherein an average percentage gear stage step lies within a range of fifteen percent (15%) to thirty percent (30%).

A multi-sprocket arrangement for a bicycle includes a larger sprocket having a passage recess on an outer link plate passage tooth on an outboard side of the larger sprocket facing a smaller sprocket. The recess is on a side of the larger sprocket facing the smaller sprocket. The passage recess extends from a radially outer tooth tip of the outer link plate passage tooth to a non-load tooth flank of the outer link plate passage tooth or a tooth base directly adjacent to the outer link plate passage tooth such that during a gear shifting of a chain from a larger sprocket to a directly adjacent smaller sprocket, the chain passes the outer link plate passage tooth on the outboard side of the sprocket.

A bicycle rear sprocket comprises a sprocket body and a plurality of sprocket teeth. The plurality of sprocket teeth includes a plurality of first teeth. Each tooth of the plurality of first teeth has a driving surface and a non-driving surface provided on a reverse side of the driving surface in a circumferential direction with respect to the rotational center axis. Each tooth of the plurality of first teeth has an axial maximum tooth-width and an axial driving-surface tooth-width. The axial maximum tooth-width is defined in an axial direction of the rotational center axis as a maximum width in each tooth of the plurality of first teeth. The axial driving-surface tooth-width is smaller than the axial maximum tooth-width. The plurality of first teeth accounts for at least 25% of the plurality of sprocket teeth.

A bicycle rear sprocket comprises a sprocket body and a plurality of sprocket teeth. The plurality of sprocket teeth includes a plurality of first teeth. Each tooth of the plurality of first teeth has a driving surface and a non-driving surface provided on a reverse side of the driving surface in a circumferential direction with respect to the rotational center axis. Each tooth of the plurality of first teeth has an axial maximum tooth-width and an axial driving-surface tooth-width. The axial maximum tooth-width is defined in an axial direction of the rotational center axis as a maximum width in each tooth of the plurality of first teeth. The axial driving-surface tooth-width is smaller than the axial maximum tooth-width. The plurality of first teeth accounts for at least 25% of the plurality of sprocket teeth.

A bicycle capable of measuring power is disclosed. The bicycle comprises 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 bicycle sprocket comprises a sprocket body and a plurality of sprocket teeth including at least one first tooth to initially disengage with the bicycle chain in a shifting operation where the bicycle chain shifts from the bicycle sprocket to an adjacent smaller bicycle sprocket. At least one second tooth is disposed adjacent to the at least one first tooth at an upstream side of the at least one first tooth in a driving rotational direction of the bicycle sprocket. The at least one second tooth has a first tooth height. At least one third tooth is disposed adjacent to the at least one second tooth at the upstream side of the at least one second tooth. The at least one third tooth has a second tooth height longer than the first tooth height.

A bicycle sprocket comprises a sprocket body and a plurality of sprocket teeth including at least one first tooth to initially disengage with the bicycle chain in a shifting operation where the bicycle chain shifts from the bicycle sprocket to an adjacent smaller bicycle sprocket. At least one second tooth is disposed adjacent to the at least one first tooth at an upstream side of the at least one first tooth in a driving rotational direction of the bicycle sprocket. The at least one second tooth has a first tooth height. At least one third tooth is disposed adjacent to the at least one second tooth at the upstream side of the at least one second tooth. The at least one third tooth has a second tooth height longer than the first tooth height.

A bicycle hub assembly comprises a hub axle, a hub body, a sprocket support structure, and a brake-rotor support structure. The sprocket support structure includes a first torque-transmitting profile and a first externally-threaded portion. The first torque-transmitting profile is configured to transmit a rotational force between the sprocket support structure and a bicycle sprocket assembly. The first externally-threaded portion is configured to threadedly engage with a first internally-threaded portion of a first lock member. The brake-rotor support structure includes a radially external surface, a radially internal surface, and a second torque-transmitting profile configured to transmit a rotational force between the brake-rotor support structure and a brake rotor. The second torque-transmitting profile is provided on the radially external surface.

A bicycle hub assembly comprises a hub axle, a hub body, a sprocket support structure, and a brake-rotor support structure. The sprocket support structure includes a first torque-transmitting profile and a first externally-threaded portion. The first torque-transmitting profile is configured to transmit a rotational force between the sprocket support structure and a bicycle sprocket assembly. The first externally-threaded portion is configured to threadedly engage with a first internally-threaded portion of a first lock member. The brake-rotor support structure includes a radially external surface, a radially internal surface, and a second torque-transmitting profile configured to transmit a rotational force between the brake-rotor support structure and a brake rotor. The second torque-transmitting profile is provided on the radially external surface.

Chain-rings sets for power transmission systems, where at least one of the chain-rings is formed by independent segments provided with axial displacement means, where the segmentation is optimum both for shifts to a bigger chain-ring or a smaller chain-ring through a relative configuration between chain-rings, especially between the teeth involved in the power transmission during the shift, that ensure a smooth shift, efficient in the power transmission and reducing as possible the friction and the wear of the components.