Abstract: A chainless drive mechanism for transferring power from the pedals to the rear wheel of a bicycle. The chainless drive mechanism has a pedal-driven drive mechanism, a rear drive mechanism for rotating the rear wheel of a bicycle, and a drive shaft being extended between the drive mechanisms. Each of the drive mechanisms has an annular inboard casing, an annular outboard casing, an annular gear wheel and a bevel gear. The annular outboard casings are coupled to the inboard casings. The annular gear wheels are rotatably positioned between the inboard and outboard casings and have a plurality of concentrically geared rings on a side thereof facing the rearward inboard casing. The bevel gears are rotatably disposed between the rearward gear wheels and the rearward inboard casings. The bevel gears engage the geared rings of the gear wheels. The bevel gears engage toothed ends of the drive shaft.