MULTI-SPEED DRIVE SYSTEM FOR BICYCLE WHEEL HUB

Abstract

The invention relates to a system and method for a simple drivetrain of a multi-speed bicycle. The bicycle may have a drivetrain that can be switched by a mechanism by reversing pedaling. The rear wheel hub may support a sprocket with a high-speed drive chainring and a low-speed drive chainring with specialized chains to produce a specialized drive change. Rotating the pedal shaft approximately a quarter-turn in the non-rotating direction can switch the drivetrain between first and second gear ratios with a changing surface which alternately allows the engagement of the high-speed drive chainring with the rear wheel drive assembly.