Abstract: An electrically powered bicycle is disclosed including a rear fork assembly having a pair of structures extending from a frame, a wheel attached between the structures of the rear fork assembly, an electric motor mounted adjacent to the wheel, and a drive mechanism disposed between the electric motor and the wheel. The drive mechanism includes a first gear connected to a shaft of the electric motor and a second gear connected to the wheel. The first gear has a first set of teeth meshed with a second set of teeth of the second gear such that when the shaft of the electric motor turns, the second gear provides a rotating force to the wheel.

Abstract: A testing method is provided for a printed circuit board that includes a board body formed with first and second conductive traces thereon. The first and second conductive traces are configured for transmitting a high-frequency differential signal and have segments parallel to each other. Each of the segments has an inner edge proximate to the segment of the other of the first and second conductive traces, and an outer edge distal from the segment of the other of the first and second conductive traces. Each of a pair of conductive pads formed on the printed circuit board is disposed proximate to and is connected electrically to the outer edge of the segment of a respective one of the first and second conductive traces.

Abstract: An electrically powered bicycle is disclosed including a rear fork assembly having a pair of structures extending from a frame, a wheel attached between the structures of the rear fork assembly, an electric motor mounted adjacent to the wheel, and a drive mechanism disposed between the electric motor and the wheel. The drive mechanism includes a first gear connected to a shaft of the electric motor and a second gear connected to the wheel. The first gear has a first set of teeth meshed with a second set of teeth of the second gear such that when the shaft of the electric motor turns, the second gear provides a rotating force to the wheel.

Abstract: A testing method is provided for a printed circuit board that includes a board body formed with first and second conductive traces thereon. The first and second conductive traces are configured for transmitting a high-frequency differential signal and have segments parallel to each other. Each of the segments has an inner edge proximate to the segment of the other of the first and second conductive traces, and an outer edge distal from the segment of the other of the first and second conductive traces. Each of a pair of conductive pads formed on the printed circuit board is disposed proximate to and is connected electrically to the outer edge of the segment of a respective one of the first and second conductive traces.