Abstract: A generator for a bicycle includes a rotor abutting a wheel of the bicycle. A coil is mounted in the rotor and electrically connected to two bearings that are mounted on the opposite sides of the rotor by two inner wires. A stator has a shaft extending through the two bearings and a permanent magnet sleeved onto the shaft and corresponding to the coil. Two electrical ring connectors are respectively mounted on opposite ends of the shaft and electrically connected to the bearings. A light is mounted on the bicycle and electrically connected to the electrical ring connectors. The coil will rotate with the rotor relative to the stator when the bicycle is in motion and generate electricity that is transmitted to the light, and the light improves the enjoyment and safety of riding the bicycle.

Abstract: A wheel has two wheel halves, a generator, two bearings and two metal rings. The wheel halves are detachably connected to each other. The generator is composed of an annular coil seat and an annular permanent magnet. The coil seat is securely mounted between the wheel halves and has a winding wound around the coil seat. The permanent magnet is rotatably mounted between the wheel halves. Each bearing is received in one of the wheel halves and electrically connects with one end of the winding. Each ring is securely attached to one of the wheel halves to abut the bearing. Consequently, the coil seat will rotate with the wheel bodies and relative to the permanent magnet and generate electricity. The electricity will be transmitted to a lighting device or a sounding device. The enjoyment of a roller skate or a skateboard with the wheel is improved.