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A transmission system for a motorcycle or motorized tricycle, comprising a main gearbox 3 having multiple gear steps, a sub gearbox 4 coupled to the main gearbox having two widely spaced forward gears GL, GH an one reverse gear GR; and one shift lever 14 controlling the selection of the gears in the

A transmission system for a motorcycle or motorized tricycle, comprising a main gearbox 3 having multiple gear steps, a sub gearbox 4 coupled to the main gearbox having two widely spaced forward gears GL, GH an one reverse gear GR; and one shift lever 14 controlling the selection of the gears in the sub gearbox. The reverse gear may be interlocked with the neutral and lowest speed gear of the main gearbox.

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In a three-wheel vehicle having one front wheel, two rear wheels having a rotational axis perpendicular to a longitudinal centerline of said vehicle and acting as driving wheels, a drive shaft for transmitting power to said rear wheels, and an engine disposed between said front wheel and said axis o

In a three-wheel vehicle having one front wheel, two rear wheels having a rotational axis perpendicular to a longitudinal centerline of said vehicle and acting as driving wheels, a drive shaft for transmitting power to said rear wheels, and an engine disposed between said front wheel and said axis of said rear wheels, said driveshaft lying substantially on said longitudinal centerline, wherein the improvement comprises: a pedal-operated main gearbox having an input shaft coupled to an output shaft of said engine, said main gearbox being mounted substantially along said longitudinal centerline and to the rear of said engine, said main gearbox having a plurality of forward gears and an output shaft, said input shaft and said output shaft lying substantially perpendicular to said longitudinal centerline; and a lever-operated sub gearbox having a plurality of gear-shift steps, said sub gearbox being mounted aside said main gearbox, a main portion of said sub gearbox being displaced relative to said centerline, said sub gearbox having an input shaft lying substantially perpendicular to said centerline and being coupled to an output shaft of said main gearbox, said sub gearbox having an output power shaft for transmitting power to said rear wheels, said output power shaft lying perpendicular to said centerline and being coupled to said drive shaft.