Transmission system for a vehicle, preferably a bicycle

A transmission system for a human powered vehicle, such as bicycle, comprising

• an input and an output, wherein the input is arranged to be connected to a power source, and the output is arranged to be connected to a load,
• a first transmission and a second transmission between the input and the output, wherein the first transmission and the second transmission are connected in series,
• the first transmission being selectively operable according to a first transmission ratio or a second transmission ratio, and having a first clutch for switching the first transmission from the first transmission ratio to the second transmission ratio and/or vice versa;
• and
• the second transmission being selectively operable according to a third transmission ratio or a fourth transmission ratio, and having a second clutch for switching the second transmission from the third transmission ratio to the fourth transmission ratio and/or vice versa.