A system and method for a bicycle transmission. Specifically, a bicycle transmission having a housing with a first shaft passing therethrough and a set of two cones in opposing parallel alignment disposed within the housing. The first cone engaged about the first shaft, the second cone engaged about a second shaft parallel to the first shaft, the second shaft structured and arranged to have at least a proximal position and a distal position relative to the first shaft. A driver is disposed generally normally about one of the two cones and passing therebetween, the driver structured and arranged to engaging a portion of the first cone with a portion of the second cone when the second cone is in the proximal position. A driver mover structured and arranged to move the driver between the cones when the second cone is in the distal position; and a transfer element joined to an end of the second shaft.

A bicycle gearshift is operated by imposing on the chain guide a primary displacement in the axial direction with respect to a cogset, to move the chain between the sprockets. Simultaneously with imposing on the primary displacement imposing on the chain guide a secondary displacement in the radial direction with respect to the cogset. The secondary displacement is of a greater size when the primary displacement takes place in the area of the cogset with the larger sprockets whereas it is of a smaller size when the primary displacement takes place in the area of the cogset with the smaller sprockets.

A bicycle gearshift is operated by imposing on the chain guide a primary displacement in the axial direction with respect to a cogset, to move the chain between the sprockets. Simultaneously with imposing on the primary displacement imposing on the chain guide a secondary displacement in the radial direction with respect to the cogset. The secondary displacement is of a greater size when the primary displacement takes place in the area of the cogset with the larger sprockets whereas it is of a smaller size when the primary displacement takes place in the area of the cogset with the smaller sprockets.

A sprocket support comprises at least ten internal spline teeth configured to engage with a bicycle hub assembly. The at least ten internal spline teeth of the sprocket support includes at least ten internal-spline driving surfaces. The at least ten internal-spline driving surfaces each include a radially outermost edge and a radially innermost edge. A radial length is defined from the radially outermost edge to the radially innermost edge. A total of the radial lengths of the at least ten internal-spline driving surfaces is equal to or larger than 7 mm. At least one internal-spline driving surface of the at least ten internal-spline driving surfaces has a first internal-spline-surface angle defined between the at least one internal-spline driving surface of the at least ten internal-spline driving surfaces and a first radial line. The first internal-spline-surface angle ranges from 0 degree to 10 degrees.

It is intended to provide a bicycle rear sprocket assembly that can reduce shock in a gear shifting operation and can reduce changing of gear ratio during the gear shifting operation. A bicycle rear sprocket assembly includes a plurality of sprockets. A total tooth number of at least one of the plurality of sprockets is an even number. The plurality of sprockets have at least two coaxially arranged sprockets. At least one of the at least two coaxially arranged sprockets has an upshifting facilitation area and a downshifting facilitation area. Each of the at least two coaxially arranged sprockets has a total tooth number that is equal to or larger than eighteen. The tooth number difference is equal to or smaller than seven.

A bicycle cassette with increased tooth ratio includes a driver body connected to a bicycle rear hub, and multiple cogs which are sequentially mounted to the driver body with equal spacing. An additional cog is mounted to the driver body and located opposite to the rear hub. The additional cog has 8-10 teeth. The tooth ratio is increased by the additional cog and the chainring to break through the limitation of tooth ratio of existing bicycle cassettes, and to increase the number of the gears of the bicycle cassette.

A bicycle cassette with increased tooth ratio includes a driver body connected to a bicycle rear hub, and multiple cogs which are sequentially mounted to the driver body with equal spacing. An additional cog is mounted to the driver body and located opposite to the rear hub. The additional cog has 8-10 teeth. The tooth ratio is increased by the additional cog and the chainring to break through the limitation of tooth ratio of existing bicycle cassettes, and to increase the number of the gears of the bicycle cassette.

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 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).

A bicycle power supplying device is configured to easily obtain the power needed to drive a subject electric component and a bicycle electric device that includes the bicycle power supplying device. The bicycle power supplying device includes a holder and a power storage unit. The holder holds a dry cell so that the dry cell is attachable to and removable from the holder. The dry cell includes a body, a first electrode arranged on the body, and a second electrode arranged on the body. The power storage unit is configured to store power of the dry cell and supply the stored power to a subject electric component.