A bicycle driving system includes a crank assembly and a multiple rear sprocket assembly. The crank assembly includes a front sprocket including a rotational center axis and a crank arm. The front sprocket is movable relative to the crank arm in an axial direction parallel to the rotational center axis. The multiple rear sprocket assembly includes eleven or more rear sprockets.

A bicycle driving system includes a crank assembly and a multiple rear sprocket assembly. The crank assembly includes a front sprocket including a rotational center axis and a crank arm. The front sprocket is movable relative to the crank arm in an axial direction parallel to the rotational center axis. The multiple rear sprocket assembly includes eleven or more rear sprockets.

A bicycle hub assembly includes a hub axle, a hub shell, and a sprocket supporting member. The sprocket supporting member includes a tubular portion and a first tooth. The tubular portion includes an outer peripheral surface and an attachment portion provided only radially inward of the outer peripheral surface. The first tooth is configured to be attached to the attachment portion of the tubular portion. The first tooth includes a first surface and a second surface. The first surface is configured to face a mounting portion of a bicycle sprocket in a circumferential direction of the sprocket supporting member. The second surface is opposite to the first surface in the circumferential direction. The second surface is configured to face the mounting portion of the bicycle sprocket in the circumferential direction.

A bicycle controller limits decreases in the assist force when the rotational speed of a crank changes. The bicycle controller can be mounted on a bicycle including a first transmission having at least two shift stages and configured to change a ratio of rotation of a wheel to rotation of a crank, a motor that provides assistance to human power input to the crank, and a second transmission configured to transmit a rotation force from the motor to a power transmission path extending from the crank to the wheel without changing the ratio of the rotation of the wheel to the rotation of the crank. The bicycle controller includes an electronic control unit that controls the second transmission in accordance with a condition of the bicycle and either one of a condition of the first transmission and a shift instruction to the first transmission.

A bicycle controller limits decreases in the assist force when the rotational speed of a crank changes. The bicycle controller can be mounted on a bicycle including a first transmission having at least two shift stages and configured to change a ratio of rotation of a wheel to rotation of a crank, a motor that provides assistance to human power input to the crank, and a second transmission configured to transmit a rotation force from the motor to a power transmission path extending from the crank to the wheel without changing the ratio of the rotation of the wheel to the rotation of the crank. The bicycle controller includes an electronic control unit that controls the second transmission in accordance with a condition of the bicycle and either one of a condition of the first transmission and a shift instruction to the first transmission.

A drive arrangement for a bicycle may include a plurality of sprockets arranged at a rear wheel of the bicycle. The sprockets may be particularly arranged to have a spacing that facilitates the configuration of an increasing number of sprockets in the plurality of sprockets. A singular front sprocket or chainring may be used to drive the rear plurality of sprockets. A particularly configured tool may be used to configure the drive arrangement.

Solitary chainring for a bicycle front crank and drive chain, including a plurality of teeth formed thereabout. The plurality of teeth includes a first group of teeth and a second group of teeth alternating with the first group of teeth. Each tooth includes an outer face and an inner face which is opposite the outer face, and each tooth of the first group of teeth includes at least one first protrusion on the outer face or the inner face, and each tooth of the second group of teeth is formed without a first protrusion. The first protrusion is formed by a material deformation on one face of the teeth of the first group of teeth, wherein the material deformation is achieved from the inner face or the outer face, or it is formed by an application of material on one face of the teeth of the first group of teeth.

Solitary chainring for a bicycle front crank and drive chain, including a plurality of teeth formed thereabout. The plurality of teeth includes a first group of teeth and a second group of teeth alternating with the first group of teeth. Each tooth includes an outer face and an inner face which is opposite the outer face, and each tooth of the first group of teeth includes at least one first protrusion on the outer face or the inner face, and each tooth of the second group of teeth is formed without a first protrusion. The first protrusion is formed by a material deformation on one face of the teeth of the first group of teeth, wherein the material deformation is achieved from the inner face or the outer face, or it is formed by an application of material on one face of the teeth of the first group of teeth.

A bicycle crank assembly is provided with a first sprocket, a second sprocket, a crank arm, a sprocket fixing structure and an alignment tube. The first sprocket includes a plurality of first teeth and at least one first mounting portion having a first mounting opening. The second sprocket includes a plurality of second teeth and at least one second mounting portion having a second mounting opening. The crank arm includes at least one sprocket attachment portion having a third mounting opening. The sprocket fixing structure secures the first and second sprockets to the crank arm via the first, second and third mounting openings. The alignment tube extends through at least two of the first, second and third mounting openings.

A method of making a bicycle sprocket having a rotational center axis basically includes providing an annular portion and forming a first tooth and a second tooth. The annular portion is made of a base material and has a plurality of teeth. At least one of the teeth is processed to form a first tooth, and at least one other of the teeth is processed to form a second tooth. The first tooth has a first axial chain engaging width that is smaller than a first axial spacing of an outer link of a bicycle chain and larger than a second axial spacing of an inner link that is coupled to an outer link. The second tooth is formed to have a second axial chain engaging width that is smaller than the second axial spacing. The second tooth is formed by deforming the base material.