A method for manufacturing a gear includes providing teeth which are shaped according to an epicyclic construction; wherein: locations on a respective tooth surface of each tooth are each determined by a radial distance from an axis as a function of a cycle angle; the radial distance is in turn determined by an equidistant to a gear trajectory; locations on the gear trajectory are respectively determined by the vector sum of a cycle vector and an epicycle vector; a tail of the cycle vector lies on the axis and a tail of the epicyclic vector lies in the tip of the cycle vector; an epicycle angle of the epicycle vector is n times as large as that cycle angle and a length of the cycle angle is greater than a length of the epicycle angle; and n is a number of the round engagement portions of the harmonic pin ring transmission which is at least three.

A bicycle rolling-element bearing assembly includes an outer bearing ring, an inner bearing ring, a plurality of rolling elements disposed between the outer bearing ring and the inner bearing ring and rotatably supporting the outer bearing ring relative to the inner bearing ring, and a lubricant reservoir, configured as a first cage, for storing and dispensing a lubricant, the first cage including bridge elements extending between the rolling elements and at least one side ring connecting the bridge elements.

A shaft characterized by its length to diameter ratio being less than about 1.75 having a drive connection at one end where the wall thickness of the shaft is selected to be thick enough to avoid ellipticalization strain error in torsional measurement of less than 5%. One specific application is for a crankset spindle that can be used to measure a cyclist right, left, and total leg torque.

A one-way bearing, a bearing assembly, and a free-wheeling mechanism for a bicycle are disclosed herewith. The bearing assembly, comprises a one-directional bearing having an inner and outer race, a first thrust bearing and a second thrust bearing, wherein the inner and outer races of the one-directional bearing are formed to retain one or both of the thrust bearings. The one-way bearing comprises an outer race and an inner race with a one-directional bearing mechanism located between said inner and outer races, the inner race comprising an inner race ring portion, with an inner flange projecting from the inner race ring portion in a first direction parallel to an axis of rotation of the bearing, and an outer flange, projecting in a second direction away from the axis of rotation of the bearing, an outer race comprising an outer race ring portion and an outer flange portion extending axially inwardly from the outer race ring portion, there therefore being defined a first bearing surface around an outer circumference of the inner race ring portion, a second bearing surface defined by the inner circumference of the outer race ring portion, a third bearing surface defined by a first sidewall of the inner race ring portion and/or the inner flange, a fourth bearing surface defined by a second sidewall of the inner race ring portion and/or the outer flange and a fifth bearing surface defined by an inner surface of the outer race flange portion.

To provide a rear wheel braking device for a motorcycle that can reduce an unsprung mass and the number of pieces of components on the rear wheel side of a shaft drive type motorcycle. In a rear wheel braking device for a motorcycle transmitting a drive force of a power unit of a motorcycle to a rear wheel through a drive shaft that extends in a vehicle longitudinal direction, the drive shaft includes a propeller shaft that is connected to a rear end of an output shaft through a universal joint, the output shaft protruding to the vehicle body rear side from a case member of the power unit. A brake disk is attached to the output shaft, the brake disk being braked by a rear wheel brake caliper. The rear wheel brake caliper is fixed to a bracket that is arranged in the case member, and is disposed on the vehicle body upper side of the brake disk.

A unidirectional rotary bearing contains a bearing body, multiple rollers, two rotatable driving rings, and at least two homing springs. The bearing body includes an internal surface and two peripheral surfaces, the internal surface has multiple receiving grooves each having an engagement segment and a disengagement segment, and each peripheral surface has a circular groove. Each of the multiple rollers is columnar and has a diameter which is more than an engaging depth of the engagement segment of each receiving groove of the bearing body and is less than a disengaging depth of the disengagement segment of each receiving groove of the bearing body, and each roller has two drive extensions. A diameter of each of the multiple apertures is more than each of the two drive extensions and is less than the diameter of each roller.

An electronic cable puller for a bicycle includes a housing, a drive supported by the housing, and an adjuster connected to the housing. The drive is powerable by a power source and is configured to pull the shift cable into or allow the shift cable to be pulled out of the electronic cable puller. The adjuster is configured to adjust a length of the shift cable relative to a sheath.

A bearing cup for a bicycle bottom bracket assembly is disclosed. The bearing cup comprises an annular body having a radially outer substantially cylindrical surface portion configured to be coupled with the frame of the bicycle and a radially inner substantially cylindrical surface portion defining a housing seat for a bearing. A plurality of ribs extend radially inwards from said radially inner substantially cylindrical surface portion. The plurality of ribs are configured to be coupled with interference with said bearing. In another embodiment, a bicycle bottom bracket assembly is disclosed that includes the aforementioned bearing cup and a bearing configured to be housed inside the bearing cup.

A gear shifting system derailleur having a derailleur integrable with devices having a positionable chain, belt and/or a plurality of sprockets. The derailleur includes, a frame, a linear actuator having a housing, two bracket links and a damping element. The linear actuator includes a linearly positionable arm. The bracket links and a damping element are positioned and adapted to apply a biased force against the linearly positionable arm. The damping element is coupled with both the chain pulley and the bracket links, wherein the damping element positions the chain pulley within the derailleur as driven by the bracket links. Wireless and/or wired communications and control modules and pathways are provided to enable user control of the linearly positionable arm. The derailleur may be attached to or comprised within a vehicle, such as a bicycle, a tricycle or a vehicle with more wheels.

A bicycle pedal structure includes a pedal body having an axle bore; an axle member axially passing through the pedal body and rotatably combined with the pedal body, with the connection portion of the axle member combined with a crank of a bicycle; and an end cap having a combination portion which is removably combined with another combination of the axle member. The combination bore of the end cap is allowed to be combined with a corresponding tool for driving the axle member to rotate. With such a removable end cap, the replacement of the end cap and pedal components is facilitated.