A power-assist drive system for a vehicle (e.g., a bicycle) is provided. The system includes a drive unit assembly attached to a frame of a vehicle and a motor having an output shaft, and a drive gear rotatably associated with the output shaft. The system further includes a driven unit assembly including a driven gear configured to be attached to a wheel hub of the vehicle, and a brake disc coaxially attached to the driven gear. The drive gear may be configured to operably engage the driven gear to transmit power from the motor to the wheel hub. A brake caliper may be integrated with the drive unit assembly. The system may further include a battery and a speed controller configured to receive an input signal to selectively direct electrical power from the battery to the motor to drive the wheel via the drive gear and the driven gear.

A sensor wheel for a human-powered vehicle comprises a wheel body and an attachment part. The wheel body is configured to be rotatable relative to a vehicle body of the human-powered vehicle about a rotational axis along with a rotational hub of the human-powered vehicle. The wheel body includes a plurality of openings spaced apart from each other in a circumferential direction with respect to the rotational axis. The attachment part is configured to be operatively coupled to the rotational hub. At least one opening of the plurality of openings has a radial length defined radially with respect to the rotational axis. The radial length is equal to or larger than 8 mm.

A wheel hub (10) comprises a main body (12) and a drive axle arrangement (14) extending through the main body (12). The main body (12) is rotatable about the drive axle arrangement (14). The wheel hub (10) further includes a transmission assembly comprising first and second transmission arrangements (44, 46). The first transmission arrangement (44) is provided on the drive axle arrangement (14), and the second transmission arrangement (46) is provided on the main body (12). The first transmission arrangement (44) is cooperable with the second transmission arrangement (46) to transmit a driving force from the drive axle arrangement (14) to the main body (12). The drive axle arrangement (14) comprises an axle portion (34) and a sprocket carrier (42). The axle portion (34) extends through the main body (12), and the sprocket carrier (42) is configured to carry at least one sprocket.

A wheel module for a vehicle is disclosed including a wheel, said wheel having a wheel rim; a wheel axle, the wheel rim being rotatably mounted on said wheel axle; and a braking device for braking the wheel, said braking device comprising a brake disc and a brake pad. The brake disc and the brake pad being mutually contactable in order to transmit a braking force F1 to the wheel rim, wherein the brake disc can be axially moved to contact the brake pad and the brake pad remains axially fixed.

A brake unit for a vehicle is disclosed, including a housing, a hydraulic unit, a braking element unit, wherein the braking element unit forms or supports a braking partner in a braking device for the vehicle. The housing, the hydraulic unit and/or the braking element unit define a main axis, wherein the hydraulic unit moves the braking element unit in an axial direction relative to the housing, in order to generate a braking force, and having a guide unit. The guide unit guides the braking element unit in the radial direction during the axial movement, wherein the guide unit has a master guide and an auxiliary guide, wherein the master guide and the auxiliary guide are arranged eccentrically.

An adjustable axle retaining structure is disclosed. The structure includes an axle receiving feature on a first leg of a fork assembly and a retaining sleeve within a clamping member on a second leg of the fork assembly. An axle is inserted through the clamping member, the wheel hub and coupled with the axle receiving feature. A component of the axle is tightened thereby moving the retaining sleeve partially out of the clamping member and toward the wheel hub until the wheel hub is in contact with both the retaining sleeve and the axle receiving feature, wherein the moving of the retaining sleeve allows the axle to radially couple the wheel hub with the fork assembly without modifying a preestablished geometry of the fork assembly.

A brake system includes a driving part driven by electric power to adjust braking force applied to a rotary body of a human-powered vehicle and an electronic controller configured to control the driving part in accordance with a rotational state of the rotary body. The electronic controller has a plurality of control modes including a first mode that drives the driving part in accordance with a user operation and a second mode that does not drive the driving part regardless of the user operation. The electronic controller is configured to switch the plurality of control modes based on setting information related to an input to the human-powered vehicle.

Example brake systems and apparatus for providing pitch control on bicycles are described herein. An example rear brake caliper described herein includes a caliper housing to be coupled to the bicycle. The caliper housing includes a first port to be fluidly coupled to a first fluid line fluidly coupled to a front brake actuator and a second port to be fluidly coupled to a second fluid line fluidly coupled to a front brake caliper. The rear brake caliper also includes a valve between the first port and the second port. The valve is operable to affect fluid flow between the first port and the second port.

An electronic bicycle includes a torque control system that controls what torque is applied to wheels of the electronic bicycle by electronic hub motors. The torque control system may determine a torque to apply to the wheels based on user input signals. The torque control system also may detect when the wheels of the electronic bicycle are slipping, and adjust the torque to minimize the time that the wheel is slipping. Additionally, the torque control system may determine a coefficient of friction between the wheels and the ground and determine a maximum torque to apply to the wheels based on the coefficient of friction. Furthermore, when braking, the torque control system may determine whether torque is applied to the wheels by passive braking or by active braking.

An electronic bicycle includes a torque control system that controls what torque is applied to wheels of the electronic bicycle by electronic hub motors. The torque control system may determine a torque to apply to the wheels based on user input signals. The torque control system also may detect when the wheels of the electronic bicycle are slipping, and adjust the torque to minimize the time that the wheel is slipping. Additionally, the torque control system may determine a coefficient of friction between the wheels and the ground and determine a maximum torque to apply to the wheels based on the coefficient of friction. Furthermore, when braking, the torque control system may determine whether torque is applied to the wheels by passive braking or by active braking.