An integrated motor-gear drive unit, for example an in-wheel motor drive unit, for transmitting rotational movement from a motor output shaft with cycloidal reduction to an outer rotatable body; the integrated motor-gear drive unit comprising: a. a mounting carrier body and a secondary carrier body, wherein the mounting carrier body and the secondary carrier body are structurally connected by at least two carrier pin devices (4,11) forming a combined carrier body (2,3,4,11); b. an outer rotatable body rotatably supported on the mounting carrier body and on the secondary carrier body; c. a motor and a rotatable motor output shaft, wherein the motor is mounted to or is part of the mounting carrier body, d. at least one cycloidal gear disc and an eccentric body, wherein the eccentric body is rotatably supporting the cycloidal gear disc and wherein the motor output shaft is arranged for rotating the eccentric body within the cycloidal gear disc, and wherein said at least one gear disc has at least two holes corresponding to said at least two carrier pin devices (4,11), and wherein each carrier pin device (4,11) protrudes through a corresponding hole; e. wherein each said at least one gear disc is provided with an external gear profile and the outer rotatable body is provided with an internal gear profile and wherein the external gear profile of the cycloidal gear disc meshes with the internal gear profile of the outer rotatable body for transmitting rotational motion of the motor output shaft to the outer rotatable body, wherein the internal gear profile of the outer rotatable body is formed by an internal gear teeth profile and the external gear profile of the cycloidal gear disc is formed by an external gear teeth profile; characterised in that f. the integrated motor gear-drive unit comprises multiple gear discs and corresponding eccentric bodies wherein-the eccentric bodies are rotatably drivable by the motor output shaft and/or by a drive shaft connected to the motor output shaft, wherein an external profile in the form of a profiled circumference is provided on the motor output shaft or on the drive shaft or on a separate outer bushing structurally connected to the drive- and/or motor output shaft (6,6m), wherein an axial opening formed in the corresponding eccentric body is provided with a corresponding internal profile; g. wherein the eccentric bodies are provided with an internal profile that can interlock with the provided external profile to enable accurate positioning of the eccentric bodies and their relative angles. a. a mounting carrier body and a secondary carrier body, wherein the mounting carrier body and the secondary carrier body are structurally connected by at least two carrier pin devices (4,11) forming a combined carrier body (2,3,4,11); b. an outer rotatable body rotatably supported on the mounting carrier body and on the secondary carrier body; c. a motor and a rotatable motor output shaft, wherein the motor is mounted to or is part of the mounting carrier body, d. at least one cycloidal gear disc and an eccentric body, wherein the eccentric body is rotatably supporting the cycloidal gear disc and wherein the motor output shaft is arranged for rotating the eccentric body within the cycloidal gear disc, and wherein said at least one gear disc has at least two holes corresponding to said at least two carrier pin devices (4,11), and wherein each carrier pin device (4,11) protrudes through a corresponding hole; e. wherein each said at least one gear disc is provided with an external gear profile and the outer rotatable body is provided with an internal gear profile and wherein the external gear profile of the cycloidal gear disc meshes with the internal gear profile of the outer rotatable body for transmitting rotational motion of the motor output shaft to the outer rotatable body, wherein the internal gear profile of the outer rotatable body is formed by an internal gear teeth profile and the external gear profile of the cycloidal gear disc is formed by an external gear teeth profile; characterised in that f. the integrated motor gear-drive unit comprises multiple gear discs and corresponding eccentric bodies wherein-the eccentric bodies are rotatably drivable by the motor output shaft and/or by a drive shaft connected to the motor output shaft, wherein an external profile in the form of a profiled circumference is provided on the motor output shaft or on the drive shaft or on a separate outer bushing structurally connected to the drive- and/or motor output shaft (6,6m), wherein an axial opening formed in the corresponding eccentric body is provided with a corresponding internal profile; g. wherein the eccentric bodies are provided with an internal profile that can interlock with the provided external profile to enable accurate positioning of the eccentric bodies and their relative angles.