A bicycle includes a frame, a motor, a battery, and a key interface. The frame includes a head tube, a down tube coupled to the head tube, a central hub coupled to an end of the down tube opposite the head tube and defining an internal cavity, and a mount positioned at least partially directly underneath the internal cavity. The motor is coupled to the mount such that the motor is positioned at least partially underneath the internal cavity. The battery extends at least partially into the internal cavity of the central hub and positioned at least partially directly above the motor. The battery is configured to power the motor. The key interface is supported by the mount. Engaging the key interface releases the battery to facilitate removing the battery from the frame.

A bicycle includes a frame, a motor, a battery, and a key interface. The frame includes a head tube, a down tube coupled to the head tube, a central hub coupled to an end of the down tube opposite the head tube and defining an internal cavity, and a mount positioned at least partially directly underneath the internal cavity. The motor is coupled to the mount such that the motor is positioned at least partially underneath the internal cavity. The battery extends at least partially into the internal cavity of the central hub and positioned at least partially directly above the motor. The battery is configured to power the motor. The key interface is supported by the mount. Engaging the key interface releases the battery to facilitate removing the battery from the frame.

An ebike comprises a front wheel, a rear wheel, a frame structure supported on the front wheel and the rear wheel, a crank assembly, and a battery assembly. The frame structure can include a front fork supported on the front wheel, a head tube coupled to the front fork, and a down tube extending downward and rearward from the head tube, the down tube defining a down tube axis and being open at its lower end. The crank assembly can be supported by the frame structure and can be rotatable about a crank axis that is spaced rearward from the down tube axis. The battery assembly can be at least partially secured in the down tube in an installed position and can be slidable into the down tube from the lower end of the down tube along the down tube axis.

An auxiliary power device adapted for use with a bicycle includes a drive unit, first and second one-way transmissions that are adapted to be mounted in a bike frame of the bicycle, a crankshaft and a transmission sprocket. The first one-way transmission is connected between the drive unit and the transmission sprocket. The second one-way transmission is mounted between the crankshaft and the transmission sprocket. When rotation of the transmission sprocket is driven by the drive unit via the first one-way transmission, the second one-way transmission is idling. When rotation of the transmission sprocket is driven by the crankshaft via the second one-way transmission, the first one-way transmission is idling.

An ebike comprises a front wheel, a rear wheel, a frame structure supported on the front wheel and the rear wheel, a motor assembly coupled to the frame structure, and a battery assembly configured to be coupled to the frame structure. The frame structure includes a head tube, a down tube, a top tube, a seat tube, and a diagonal tube coupling the top tube with the seat tube. The battery assembly is configured to be at least partially positioned in the down tube. The ebike further includes a user interface configured to be supported by the frame structure, and further includes an electrical cable coupling the user interface with the motor assembly, the electrical cable being positioned at least partially in the diagonal tube.

A bicycle comprises a front wheel, a rear wheel, a frame structure including a hollow seat tube. The bicycle further comprises a dropper seat post supported by the hollow seat tube, a loop stay positioned in the frame structure below the dropper seat post, and a control housing positioned in the frame structure for actuating the dropper seat post. The control housing includes a lower loop wrapped around at least a portion of the loop stay. The bicycle may further comprise a motor assembly coupled to the frame structure by a motor fastener, wherein the loop stay is coupled to the frame structure by the motor fastener. The frame structure may further include a top tube and a diagonal tube (e.g., a sided tube) coupling the top tube with the hollow seat tube, and the control housing may be at least partially positioned in the diagonal tube.

An ebike comprises a front wheel, a rear wheel, a frame structure supported on the front wheel and the rear wheel, the frame structure including a hollow tube (e.g., a down tube) having a converging inner surface, and a battery assembly configured to be coupled to the frame structure in an installed position at least partially in the hollow tube. The converging inner surface is configured such that at least a portion of the battery assembly is supported within the hollow tube by the converging inner surface when the battery assembly is at least partially positioned in the hollow tube. In one embodiment, the battery assembly comprises a battery housing and a resilient lateral support, wherein the resilient lateral support resiliently laterally supports a portion of the battery housing in the hollow tube when the battery assembly is positioned in the hollow tube.

A bicycle bottom bracket set has two bearing cups, the bearing cup has a built-in ring, a tightening socket and a bearing. The built-in ring and the tightening socket are provided with a guiding end and a connecting portion. When the bearing cup screw is installed, the guiding end of the built-in ring can be gradually opened and pressed against the inner wall of the bottom bracket. When the bottom bracket has inner diameter offsets caused by the heat expansion and contraction factor or the poor processing, the combination of the forced tension of the bearing cup can achieve the purpose of structurally limiting. The stability of the structural installation while ensuring the safety of the structure.

A bicycle bottom bracket set has two bearing cups, the bearing cup has a built-in ring, a tightening socket and a bearing. The built-in ring and the tightening socket are provided with a guiding end and a connecting portion. When the bearing cup screw is installed, the guiding end of the built-in ring can be gradually opened and pressed against the inner wall of the bottom bracket. When the bottom bracket has inner diameter offsets caused by the heat expansion and contraction factor or the poor processing, the combination of the forced tension of the bearing cup can achieve the purpose of structurally limiting. The stability of the structural installation while ensuring the safety of the structure.

A bicycle frame is discussed having a battery fully contained within a down tube of the bicycle frame. The battery may be inserted into or removed from the down tube via a through opening through a bottom bracket housing of the bicycle frame. Weakness in the bottom bracket housing due to the through opening may be compensated for, fully or partially, by utilizing a bottom bracket bearing assembly that has a structural component, or structural component assembly, that extends completely through the bottom bracket housing and removably couples to the bottom bracket housing.