Abstract: An electric generator for a bicycle comprising, a rotor assembly comprising a plurality of magnets disposed at regular spacings around the circumference of the rotor assembly in alternating polarity, a stator core, comprising steel plates being stacked to form the stator core, each steel plate having a U-shaped grooved cross-section with two oppositely extending magnetically engaging members, a power-generating coil is wound around the U-shaped groove of the steel plates of the stator core, and the magnetically engaging members are positioned to magnetically engage the magnets of the rotor assembly.