A locking/unlocking system for traction systems actuated by pedal levers, which includes: a blocking element (1); a receiving element (10); an automatic activation means (3) for coupling and uncoupling the blocking element (1) of the receiving element (10); at least, a control means (16) for controlling the automatic activation means (3); at least, a switch (15a, 15b) for turning the control means on and/or off (16); and at least, a power source (17). A pedal lever (9) for traction systems actuated by pedal levers, which includes: a locking/unlocking system, in accordance with this invention. A traction system actuated by pedal levers, which in turn includes: a pedal lever (9) in accordance with this invention on each of the two ends of the central axis (8), which is introduced and fastened to the adapter (7) of the freewheel (6), or directly onto the freewheel (6) of the lever (9).

A locking/unlocking system for traction systems actuated by pedal levers, which includes: a blocking element (1); a receiving element (10); an automatic activation means (3) for coupling and uncoupling the blocking element (1) of the receiving element (10); at least, a control means (16) for controlling the automatic activation means (3); at least, a switch (15a, 15b) for turning the control means on and/or off (16); and at least, a power source (17). A pedal lever (9) for traction systems actuated by pedal levers, which includes: a locking/unlocking system, in accordance with this invention. A traction system actuated by pedal levers, which in turn includes: a pedal lever (9) in accordance with this invention on each of the two ends of the central axis (8), which is introduced and fastened to the adapter (7) of the freewheel (6), or directly onto the freewheel (6) of the lever (9).

A control device for controlling a transmission ratio between a traction means and a sprocket set rotatable about an axle may include at least two sprockets alternatively wrapped around by the traction means. At least one of the sprockets may include several independently adjustable rim segments. Adjustment of the rim segments in relation to a fixed plane may be effected by a control device in a direction substantially transverse to the plane. The control device includes at least one electrically actuatable control element, e.g., a servomotor. The at least one control element is configured to rotate with the sprockets.

A control device for controlling a transmission ratio between a traction means and a sprocket set rotatable about an axle may include at least two sprockets alternatively wrapped around by the traction means. At least one of the sprockets may include several independently adjustable rim segments. Adjustment of the rim segments in relation to a fixed plane may be effected by a control device in a direction substantially transverse to the plane. The control device includes at least one electrically actuatable control element, e.g., a servomotor. The at least one control element is configured to rotate with the sprockets.

A bicycle crank may include a first lug, a second lug and a transition region. The first lug is for connecting a spindle. The second lug is for connecting a pedal. The transition region interconnects the first lug and the second lug, and is formed from a fiber reinforced thermoplastic material that includes a fiber component and a thermoplastic component.

A bicycle crank may include a first lug, a second lug and a transition region. The first lug is for connecting a spindle. The second lug is for connecting a pedal. The transition region interconnects the first lug and the second lug, and is formed from a fiber reinforced thermoplastic material that includes a fiber component and a thermoplastic component.

A bicycle includes a transmission having two switchable drives between a driver body on which rear sprockets are positioned and a wheel hub of a rear wheel. The bicycle has actuation elements for switching between drives and operating elements for operating the actuation elements. The bicycle includes only a single front sprocket. The actuation elements are embodied in an electrical version and the operating elements are electrically coupled to the actuation elements. By advantageously selecting the drives of the driver between the cassette housing and wheel hub, a front derailleur may be omitted. The driver allows operation with only little energy, since the chain need not be shifted. consequently, the actuation elements require little energy for changing the drive between the crank axle and the wheel hub of the bicycle, so that it is pre-eminently suitable for these actuation elements and their operation to be executed as an electrical version.

A bicycle includes a transmission having two switchable drives between a driver body on which rear sprockets are positioned and a wheel hub of a rear wheel. The bicycle has actuation elements for switching between drives and operating elements for operating the actuation elements. The bicycle includes only a single front sprocket. The actuation elements are embodied in an electrical version and the operating elements are electrically coupled to the actuation elements. By advantageously selecting the drives of the driver between the cassette housing and wheel hub, a front derailleur may be omitted. The driver allows operation with only little energy, since the chain need not be shifted. consequently, the actuation elements require little energy for changing the drive between the crank axle and the wheel hub of the bicycle, so that it is pre-eminently suitable for these actuation elements and their operation to be executed as an electrical version.

A control device including an electronic controller for controlling a human-powered vehicle. The electronic controller is configured to control an adjusting device that is configured to adjust a seat height of the human-powered vehicle upon determining the human-powered vehicle is being stopped while traveling uphill.

A control device including an electronic controller for controlling a human-powered vehicle. The electronic controller is configured to control an adjusting device that is configured to adjust a seat height of the human-powered vehicle upon determining the human-powered vehicle is being stopped while traveling uphill.