Drive train comprising two separate shiftable gear mechanisms which are coupled by means of intermediate gear mechanisms

A drive train for muscle-driven single- or multi-track vehicles comprising:

• a first gearbox comprising a crank-driven bottom bracket gearbox which is connected on an output side to a chain or belt drive, from which a chain or belt leads directly or switchably in each case to a pinion of a rear wheel hub, wherein the crank-driven bottom bracket gearbox having n speeds,
• a second gearbox arranged downstream from the first gearbox in the drive train as a shiftable rear wheel hub gearbox with m=two or m=three speeds, where the n and m are natural numbers, so that the drive train comprises up to n times m speeds, where the n speeds are arranged in the bottom bracket gearbox and the m speeds are arranged in the rear-mounted gearbox,
• wherein said crank-driven bottom bracket gearbox comprises a first shift drum and said rear wheel hub gearbox comprises a second shift drum, each of the first shift drum and the second shift drum comprises at least one of control curves and control grooves, and the first shift drum and the second shift drum to be continuously shifted from a single rotary or shifting handle.