A derailleur comprises a base member configured to be attached to a human-powered vehicle frame, a movable member movable with respect to the base member, a pulley assembly pivotally attached to the movable member in a first pivotal direction and a second pivotal direction opposite to the first pivotal direction and including a first pulley having a first pulley axis and a second pulley having a second pulley axis, a pulley assembly biasing member configured to bias the pulley assembly with respect to the movable member in the first pivotal direction, a pulley distance (centimeter) being defined between the first pulley axis and the second pulley axis, a biasing return force (newton) being defined by rotational force of the pulley assembly relative to the movable member, and a return value defined by the biasing return force multiplied by the pulley distance. The return value is 136 or larger.

A bicycle derailleur includes a base element, a movable element having a receptacle and movably coupled to the base element, a rotary shaft mounted in the movable element in the receptacle to be rotatable about an axis of rotation, and a chain guide assembly rotatable relative to the movable element about the axis of rotation and which is coupled rotationally conjointly to the rotary shaft. An elastic force store device exerts on the chain guide assembly a preload force which preloads said chain guide assembly in a direction of rotation relative to the movable element. A damping device acts directly or indirectly between the movable element and the chain guide assembly and has a coupling device arranged radially within the first elastic force store device by which the damping device is coupled to a support, which is static in relation to the movable element, and the rotary shaft.

A drivetrain assembly comprises a bottom bracket shell defining a front axis, a dropout defining a rear axis, a chainstay member attached to the dropout and the bottom bracket shell, a front sprocket and a rear sprocket, and a chain or belt including a bottom section extending from a first contact point between the chain or belt and the front sprocket to a second contact point between the chain or belt and the rear sprocket. The chainstay member fixes the dropout relative to the bottom bracket shell, such that a chainstay length is non-variable, and such that the chain or belt has a predetermined tension defined by a midpoint of the bottom section being vertically displaceable only by a maximum vertical extent within a predetermined range upon application of a predetermined load at the midpoint of the bottom section.

A drivetrain assembly comprises a bottom bracket shell defining a front axis, a dropout defining a rear axis, a chainstay member attached to the dropout and the bottom bracket shell, a front sprocket and a rear sprocket, and a chain or belt including a bottom section extending from a first contact point between the chain or belt and the front sprocket to a second contact point between the chain or belt and the rear sprocket. The chainstay member fixes the dropout relative to the bottom bracket shell, such that a chainstay length is non-variable, and such that the chain or belt has a predetermined tension defined by a midpoint of the bottom section being vertically displaceable only by a maximum vertical extent within a predetermined range upon application of a predetermined load at the midpoint of the bottom section.

A bicycle drivetrain having a rear derailleur, a chain tensioner, and a chain guiding element which can be an idler pulley. The chain tensioner is separate from the rear derailleur and can be placed near the pedal crank. The bicycle to which the drivetrain is mounted has a drive chain, and the position of the lower portion of the drive chain (i.e. the portion of the drive chain that is not tensioned from pedaling forces) is elevated relative to that of bicycles with drivetrains having conventional rear derailleurs.

A bicycle drivetrain having a rear derailleur, a chain tensioner, and a chain guiding element which can be an idler pulley. The chain tensioner is separate from the rear derailleur and can be placed near the pedal crank. The bicycle to which the drivetrain is mounted has a drive chain, and the position of the lower portion of the drive chain (i.e. the portion of the drive chain that is not tensioned from pedaling forces) is elevated relative to that of bicycles with drivetrains having conventional rear derailleurs.

A pedally propelled vehicle drive train includes a housing, a crankshaft, an internal multi-speed gear with co-axial input and output shafts, and an electric motor with an output shaft. The crankshaft, the input and output shafts of the internal multi-speed gear and the output shaft of the electric motor are all arranged in parallel.

A pedally propelled vehicle drive train includes a housing, a crankshaft, an internal multi-speed gear with co-axial input and output shafts, and an electric motor with an output shaft. The crankshaft, the input and output shafts of the internal multi-speed gear and the output shaft of the electric motor are all arranged in parallel.

A chain guide is disclosed herein. The chain guide includes a backplate and a chain guide. The backplate has an elongated opening therein. The chain guide includes a guide to orient a chain with respect to the sprocket. The chain guide also includes a retaining assembly to removably and adjustably frictionally couple the guide at a given location along the elongated opening in the backplate, such that when the guide is rotated axially about the retaining assembly, the guide is retained at the given location.

A chain guide is disclosed herein. The chain guide includes a backplate and a chain guide. The backplate has an elongated opening therein. The chain guide includes a guide to orient a chain with respect to the sprocket. The chain guide also includes a retaining assembly to removably and adjustably frictionally couple the guide at a given location along the elongated opening in the backplate, such that when the guide is rotated axially about the retaining assembly, the guide is retained at the given location.