Abstract: Combination of a drive wheel and a gearbox for a continuous track system, the gearbox (1) comprising an annular input member (2) for connection to an end part (14) of a drive axle input member (16) and an annular output member (4) connected to the drive wheel (3), the annular input member (2) and annular output member (4) being coaxially arranged with respect to a longitudinal axis (6) of the gearbox (1). The combination further comprises an annular transmission unit (8) coaxially arranged with respect to the longitudinal axis (6) of the gearbox (1) and connecting the annular input member (2) and annular output member (4) through a gear ratio (R) of less than one, the gear ratio (R) being a ratio of an angular input velocity of the annular input member (2) to an angular output velocity of the annular output member (4).