A power transmission unit for electric bicycles includes an input structure, an output structure, a torque detection unit, a detection target, and a detection unit. The input structure includes an input shaft. The input shaft is caused to rotate by external force transmitted thereto. The input structure rotates along with the input shaft. The output structure outputs rotational power by rotating along with the input structure. The torque detection unit is provided on an outer periphery of the input structure. The detection target rotates either along with, or while interlocking with, the input structure. The detection unit detects a rotational state of the detection target. At least part of the torque detection unit and at least part of the detection target overlap with each other when viewed perpendicularly to a rotational axis of the input structure.

A power transmission unit for electric bicycles includes an input structure, an output structure, a torque detection unit, a detection target, and a detection unit. The input structure includes an input shaft. The input shaft is caused to rotate by external force transmitted thereto. The input structure rotates along with the input shaft. The output structure outputs rotational power by rotating along with the input structure. The torque detection unit is provided on an outer periphery of the input structure. The detection target rotates either along with, or while interlocking with, the input structure. The detection unit detects a rotational state of the detection target. At least part of the torque detection unit and at least part of the detection target overlap with each other when viewed perpendicularly to a rotational axis of the input structure.

A bicycle component comprising a stress/strain sensor aligned according to a stress/strain to be detected, and a temperature sensor associated with said stress/strain sensor, wherein said stress/strain sensor and said temperature sensor lie in planes that do not coincide with one another and are not parallel to each another.

A bicycle component comprising a stress/strain sensor aligned according to a stress/strain to be detected, and a temperature sensor associated with said stress/strain sensor, wherein said stress/strain sensor and said temperature sensor lie in planes that do not coincide with one another and are not parallel to each another.

A load cell for determining a radial force acting on a crankshaft includes a receiving sleeve for receiving a ring of a bearing; a fastening ring for attaching the load cell in a transmission housing; axial support areas provided on the fastening ring for axially supporting the ring of the bearing; and measuring regions for receiving radial forces of the receiving sleeve and which connect the receiving sleeve with the fastening ring, wherein strain sensors are attached to at least two of the measuring regions; and wherein the measuring regions comprise measuring lugs formed as angle brackets.

A power measurement device, which may be mounted to an inside area of a crank arm, includes processing circuitry within a housing. The processing circuitry is coupled with strain gauges mounted on the crank arm, and produces a power value that is wireless transmitted to a separate display that may receive and display power measurements. The housing may include a mounted portion and a cantilever portion where the mounted portion houses the processing circuitry and the cantilever portion houses batteries supply energy for the processing circuitry and other features.

A chainring assembly includes a chainring carrier adapted to be coupled to a crank arm. The chainring carrier is rotatable about a rotation axis, and includes an outer periphery having carrier threads. A chainring structure includes an inner periphery having chainring threads and an outer periphery comprising a plurality of teeth. The inner periphery of the chainring structure is threadably engaged with the outer periphery of the chainring carrier. In one embodiment, a power meter device includes a body having a torque input section and a torque output section, with the torque output section including an outer periphery having threads adapted to be coupled to a chainring structure.

A chainring assembly includes a chainring carrier adapted to be coupled to a crank arm. The chainring carrier is rotatable about a rotation axis, and includes an outer periphery having carrier threads. A chainring structure includes an inner periphery having chainring threads and an outer periphery comprising a plurality of teeth. The inner periphery of the chainring structure is threadably engaged with the outer periphery of the chainring carrier. In one embodiment, a power meter device includes a body having a torque input section and a torque output section, with the torque output section including an outer periphery having threads adapted to be coupled to a chainring structure.

A signal detection device includes a strain gauge disposed in a strain gauge disposition section defined on a rotation spindle; a control circuit board disposed in the strain gauge disposition section and electrically connected to the strain gauge; an electrical power supply unit received in a receiving space defined in a pedal body to supply electrical power; an electric brush device disposed in a brush disposition section defined on the rotation spindle and set between the pedal body and the rotation spindle. The electric brush device is electrically connected to the control circuit board to supply the electrical power to the control circuit board. The electric brush device keeps the electrical power supply unit in electrical connection with the control circuit board whether the pedal body is rotating relative to the rotation spindle or not. Alternatively, the signal detection device adopts a structure of contact pin assembly and a removable battery assembly located between a free end of the rotation spindle and an end cap of the pedal body.

A cleat adapter system is provided for a cycling shoe. The cleat adapter system comprises a first connecting portion, a second connecting portion, an actuator, a communicator and a controller. The first connecting portion is configured to be connected to a cleat. The second connecting portion is connected to the first connecting portion. The actuator operatively is coupled to one of the first connecting portion and the second connecting portion. The second connecting portion is configured to adjust a relative position between the first connecting portion and the second connection portion. The communicator is configured to receive at least one of bicycle information and user information. The controller operatively couples the actuator and the communicator. The controller is configured to control the actuator to adjust the relative position based on at least one of the bicycle information and the user information.