A crank assembly for a pedal-driven vehicle includes a first member, a second member, and a rotary sensor. The first member rotates about a crank axis of the pedal-driven vehicle. The second member is rotationally coupled to the first member and is configured to pivot about the first member via a member pivot. The second member also is configured to receive a pedal at a pedal interface. The rotary sensor is coupled to the first member and configured to measure rotation of the second member relative to the first member.

A crank assembly for a pedal-driven vehicle includes a first member, a second member, and a rotary sensor. The first member rotates about a crank axis of the pedal-driven vehicle. The second member is rotationally coupled to the first member and is configured to pivot about the first member via a member pivot. The second member also is configured to receive a pedal at a pedal interface. The rotary sensor is coupled to the first member and configured to measure rotation of the second member relative to the first member.

A track racing bicycle having a head tube and/or down tube with asymmetrical left and right sides. A left side of the head tube and/or down tube may be closer to a central plane of a frame of the track racing bicycle for aerodynamic purposes. Moreover, the drivetrain may be disposed on the left side of the frame instead of the right side. Also, a rear wheel of the track racing bicycle may have a mechanism for mitigating or prohibiting forward slip of the rear wheel in the rear dropouts.

A track racing bicycle having a head tube and/or down tube with asymmetrical left and right sides. A left side of the head tube and/or down tube may be closer to a central plane of a frame of the track racing bicycle for aerodynamic purposes. Moreover, the drivetrain may be disposed on the left side of the frame instead of the right side. Also, a rear wheel of the track racing bicycle may have a mechanism for mitigating or prohibiting forward slip of the rear wheel in the rear dropouts.

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

The control device is for controlling a transmission ratio between a traction means and a wheel set rotatable about a wheel axle and including at least two wheel blades alternatively wrapped around by the traction means. At least one of the wheel blades is composed of several independently adjustable wheel rim segments. The adjustment of the wheel rim segments in relation to a fixed plane (“plane of alignment”) in which the traction means wraps around the wheel set is effected by the control device in a direction substantially transverse to the plane of alignment. The control device includes at least one electrically actuatable control element, in particular a servomotor, provided that the at least one control element is arranged to rotate with the at least two wheel blades.

The control device is for controlling a transmission ratio between a traction means and a wheel set rotatable about a wheel axle and including at least two wheel blades alternatively wrapped around by the traction means. At least one of the wheel blades is composed of several independently adjustable wheel rim segments. The adjustment of the wheel rim segments in relation to a fixed plane (“plane of alignment”) in which the traction means wraps around the wheel set is effected by the control device in a direction substantially transverse to the plane of alignment. The control device includes at least one electrically actuatable control element, in particular a servomotor, provided that the at least one control element is arranged to rotate with the at least two wheel blades.

A bicycle crank assembly is provided having a sprocket flange and a pedal crank arm, the sprocket flange being coaxially affixed to a bicycle crank shaft, the first end of the pedal crank arm being coaxially mounted about a laterally projecting generally cylindrical shaft member of the sprocket flange, a pedal bolt being affixed proximate a distal end of the pedal crank arm, and the pedal crank arm being affixed proximate the perimeter of the sprocket flange generally opposite the pedal bolt with a 145 degree offset about the axis of rotation of the bicycle crank shaft to increase the distance from the drive bolt to the pedal and to increase the leverage and power imparted to the bicycle crank assembly. A sprocket is coaxially affixed to the sprocket flange. A second pedal-powered crank assembly is coaxially affixed to the opposite end of the bicycle crank shaft, with a 180 degree offset about the axis of rotation of the bicycle crank shaft from the first pedal-powered crank assembly to provide continuous, uninterrupted torque to the bicycle crank shaft through a 360-degree rotation of the pedal-powered crank assembly.

A bicycle crank assembly is provided having a sprocket flange and a pedal crank arm, the sprocket flange being coaxially affixed to a bicycle crank shaft, the first end of the pedal crank arm being coaxially mounted about a laterally projecting generally cylindrical shaft member of the sprocket flange, a pedal bolt being affixed proximate a distal end of the pedal crank arm, and the pedal crank arm being affixed proximate the perimeter of the sprocket flange generally opposite the pedal bolt with a 145 degree offset about the axis of rotation of the bicycle crank shaft to increase the distance from the drive bolt to the pedal and to increase the leverage and power imparted to the bicycle crank assembly. A sprocket is coaxially affixed to the sprocket flange. A second pedal-powered crank assembly is coaxially affixed to the opposite end of the bicycle crank shaft, with a 180 degree offset about the axis of rotation of the bicycle crank shaft from the first pedal-powered crank assembly to provide continuous, uninterrupted torque to the bicycle crank shaft through a 360-degree rotation of the pedal-powered crank assembly.