A transmission system for transmitting power generated by an engine (2) of a vehicle comprises:
- an input shaft (8) connectable to the engine (2), the input shaft (8) extending along a first axis (A1);
- an output shaft (15; 215) extending along a second axis (A2), the second axis (A2) being different from the first axis (A1);
- a power device (6; 106; 206; 306) coaxial with one axis selected from the first axis (A1) and the second axis (A2);
- a planetary gear train (4) coaxial with one axis selected from the first axis (A1) and the second axis (A2);
- a clutch (13) located on one axis selected from the first axis (A1) and the second axis (A2).
