An apparatus, system, and method is provided for preventing the communication of contaminants between connected hollow interiors of tubes of a frame, such as a bicycle frame, for example. A hollow insert may be positioned inside a first tube of a frame such that seals on bottom and top portions of the insert are radially sealed against an interior surface of the first tube on either side of an open intersection between the first tube and other tubes of the frame, so that the interior of the first tube is not open to the interiors of the other tubes of the frame. Contaminants that then enter the first tube, such as through the headset of a bicycle head tube, for example, pass through the interior of the insert and out the bottom of the first tube, instead of passing into the interior of the frame.

The present disclosure is directed to a bicycle frame having a lug that is connected with a tube. The lug may be produced by shaping and bonding at least two plates.

The present disclosure is directed to a bicycle frame having a lug that is connected with a tube. The lug may be produced by shaping and bonding at least two plates.

A bicycle comprises a main frame and a suspension assembly coupled to the main frame. The suspension assembly includes a dynamic crank support and a spring mechanism. The dynamic crank support is movable from an uncompressed position to a compressed position. The spring mechanism biases the dynamic crank support toward the uncompressed position. The suspension assembly further comprises a dynamic seat support coupled for movement with the dynamic crank support. For example, the dynamic seat support and the dynamic crank support can be rigidly coupled to each other and cooperatively form one bar of a four-bar linkage. An eccentric assembly is supported by the main frame and rotates about a first axis. The eccentric assembly pivotally supports the dynamic crank support for rotation about a second axis offset from the first axis. The spring mechanism preferably comprises a spring secured between the main frame and the eccentric assembly to rotationally bias the eccentric assembly.

A bicycle comprises a main frame and a suspension assembly coupled to the main frame. The suspension assembly includes a dynamic crank support and a spring mechanism. The dynamic crank support is movable from an uncompressed position to a compressed position. The spring mechanism biases the dynamic crank support toward the uncompressed position. The suspension assembly further comprises a dynamic seat support coupled for movement with the dynamic crank support. For example, the dynamic seat support and the dynamic crank support can be rigidly coupled to each other and cooperatively form one bar of a four-bar linkage. An eccentric assembly is supported by the main frame and rotates about a first axis. The eccentric assembly pivotally supports the dynamic crank support for rotation about a second axis offset from the first axis. The spring mechanism preferably comprises a spring secured between the main frame and the eccentric assembly to rotationally bias the eccentric assembly.

A bicycle includes a frame, and a transmission device including a motor, a transmission unit, a crank unit, a sprocket and a unidirectional bearing. The transmission unit includes a first gear driven by the motor, a one-way clutch mounted in a compartment of the frame and connected between the first gear and the motor for limiting rotation to be transmitted from the motor to the first gear, and a second gear meshing with the first gear. The crank unit includes a crank shaft extending into the second gear, and first and second cranks connected respectively to two ends of the crank shaft. The sprocket is formed with an engaging hole non-rotatably engages the second gear and a receiving groove receives the unidirectional bearing for driving rotation of the sprocket in a single direction.

An electric-motor-assisted bicycle includes a vehicle-body frame and a drive unit including two couplers. The vehicle-body frame includes a bracket and a pair of chain stays. The drive unit is attached to the bracket. Each of the chain stays is attached to a position on the bracket rearward of a crank axle in the front/rear direction of the bicycle. One coupler is forward of the crank axle in the front/rear direction of the bicycle. The other coupler is rearward of the crank axle in the front/rear direction of the bicycle. At least one of a region of the bracket to which the chain stay is attached and a region of the bracket to which the other coupler is attached does not overlap a line segment connecting a shaft center of the axle of the rear wheel to a shaft center of the crank axle.

An electric-motor-assisted bicycle includes a vehicle-body frame and a drive unit including two couplers. The vehicle-body frame includes a bracket and a pair of chain stays. The drive unit is attached to the bracket. Each of the chain stays is attached to a position on the bracket rearward of a crank axle in the front/rear direction of the bicycle. One coupler is forward of the crank axle in the front/rear direction of the bicycle. The other coupler is rearward of the crank axle in the front/rear direction of the bicycle. At least one of a region of the bracket to which the chain stay is attached and a region of the bracket to which the other coupler is attached does not overlap a line segment connecting a shaft center of the axle of the rear wheel to a shaft center of the crank axle.

An electrically assisted vehicle includes an electric motor, a device including a microcontroller and a transmission circuit that sends motor control-related data used to control rotation of the electric motor, and a control circuit that controls the electric motor based on the data. The control circuit and the device both retain the same data generation rule. When the control circuit sends first data to the device, the microcontroller generates second data which at least includes a portion of first reception data having been received, generates third data from the second data by using the rule, and sends, via the transmission circuit, the third data to the control circuit. The control circuit generates fourth data at least from the first data by using the rule, and compares a portion of second reception data received from the device against the fourth data. If the result of comparison indicates a match, the control circuit permits control of the electric motor.

A conversion bicycle apparatus includes a chassis. The chassis includes a main tube. The chassis additionally includes a head tube. The chassis additionally includes a seat tube. The chassis additionally includes a rear fork. The rear fork includes a first fork arm and a second fork arm. The chassis additionally includes an attachment receiver. The attachment receiver is located proximate to a junction of at least the main tube and the rear fork. An attachment assembly is reversibly couplable to the attachment receiver via one or more protrusions and one or more corresponding apertures. The attachment assembly is additionally reversibly couplable to the attachment receiver via one or more fasteners.