A suspension for a steerable wheel of a motor-vehicle, comprising: - a wheel upright, - a spring-shock absorber assembly having an upper end provided with a first joint for articulated connection to the structure of the motor-vehicle, and a lower end connected to the wheel upright, - a lower oscillating arm having a first end portion connected by means of a second joint to the wheel upright and a second end portion intended to be connected by means of at least one respective joint to the motor-vehicle structure, - wherein the lower end of the spring-shock absorber assembly is indirectly connected to the wheel upright, by means of an intermediate arm rigidly connected to the lower end of the spring-shock absorber assembly, and articulated connected to an upper portion of the wheel upright, by means of a third connection joint, - said suspension comprising also an upper oscillating arm having a first end portion connected by means of a fourth joint to said intermediate arm, in a portion thereof which is in an intermediate position between the spring-shock absorber assembly and the wheel upright, said upper oscillating arm having a second end portion intended to be connected by means of at least one respective joint (Y, Z) to the motor-vehicle structure, - said suspension comprising also an auxiliary frame for supporting elements of the suspension, arranged to be rigidly connected to the structure of the motor-vehicle, wherein said second end portions of the lower oscillating arm and of the upper oscillating arm are connected by means of said respective joints to said auxiliary frame, - said auxiliary frame comprising a frame portion in the form of an upright, which rises in a vertical direction, said second end portion of the upper oscillating arm being articulated connected to an upper end of said upright frame portion, said suspension being characterized in that: - said upper oscillating arm has a triangular configuration, with a first end connected by means of said fourth joint to said intermediate arm and, on the opposite side, two end portions provided with two respective joints (Y, Z) for connection to the auxiliary frame, said joints (Y, Z) being spaced apart from each other in the longitudinal direction of the motor-vehicle, with reference to the mounted condition of the suspension on the motor-vehicle, - said frame portion in the form of an upright is also provided to connect the auxiliary frame to the motor-vehicle body. - a wheel upright, - a spring-shock absorber assembly having an upper end provided with a first joint for articulated connection to the structure of the motor-vehicle, and a lower end connected to the wheel upright, - a lower oscillating arm having a first end portion connected by means of a second joint to the wheel upright and a second end portion intended to be connected by means of at least one respective joint to the motor-vehicle structure, - wherein the lower end of the spring-shock absorber assembly is indirectly connected to the wheel upright, by means of an intermediate arm rigidly connected to the lower end of the spring-shock absorber assembly, and articulated connected to an upper portion of the wheel upright, by means of a third connection joint, - said suspension comprising also an upper oscillating arm having a first end portion connected by means of a fourth joint to said intermediate arm, in a portion thereof which is in an intermediate position between the spring-shock absorber assembly and the wheel upright, said upper oscillating arm having a second end portion intended to be connected by means of at least one respective joint (Y, Z) to the motor-vehicle structure, - said suspension comprising also an auxiliary frame for supporting elements of the suspension, arranged to be rigidly connected to the structure of the motor-vehicle, wherein said second end portions of the lower oscillating arm and of the upper oscillating arm are connected by means of said respective joints to said auxiliary frame, - said auxiliary frame comprising a frame portion in the form of an upright, which rises in a vertical direction, said second end portion of the upper oscillating arm being articulated connected to an upper end of said upright frame portion, - said upper oscillating arm has a triangular configuration, with a first end connected by means of said fourth joint to said intermediate arm and, on the opposite side, two end portions provided with two respective joints (Y, Z) for connection to the auxiliary frame, said joints (Y, Z) being spaced apart from each other in the longitudinal direction of the motor-vehicle, with reference to the mounted condition of the suspension on the motor-vehicle, - said frame portion in the form of an upright is also provided to connect the auxiliary frame to the motor-vehicle body.