Pretensionable elastic cylindrical bushing which is capable of absorbing vibrations in combination with a shaft or axle of a wheel bearing or planetary bearing passed through its eye, comprising (a) an outer cylinder and an inner cylinder, both of which are connected to one another by an elastic layer and form with the latter the bushing body around the said shaft or axle of the wheel bearing or planetary bearing, (b) at least one pressure-expandable displacement space in the space between the inner cylinder and the outer cylinder, which is formed by the elastic layer having slot-like pockets within the elastic layer or not being connected to the corresponding wall of the inner and/or outer cylinder in certain areas, but instead only lying loosely, and (c) at least one bypass space outside the bushing body for a liquid or gas as pressure medium, which is connected to the displacement space inside the bushing body via at least one connection opening in the wall of the inner cylinder of the bushing body and is supplied with the pressure medium by means of one or more lines, the pressure medium being forced out of the bypass space into the widening displacement space, so that the elastic layer is compressed and the bushing is widened over its entire periphery owing to the slots present, generating a uniform rotationally symmetrical pretensioning of the bushing, characterised in that (i) both the outer cylinder and the inner cylinder have slots arranged axially in the longitudinal direction distributed over the surfaces, and (ii) the at least one bypass space outside the bushing body is formed by a rigid or elastic separation or spacer sleeve or layer, which has cut-outs, channels or cavities which are connected to the at least one displacement space inside the bushing body for accommodation of the pressure medium, being located with a close fit between the inner cylinder of the bushing body and the shaft or axle in order to maintain a separation. (a) an outer cylinder and an inner cylinder, both of which are connected to one another by an elastic layer and form with the latter the bushing body around the said shaft or axle of the wheel bearing or planetary bearing, (b) at least one pressure-expandable displacement space in the space between the inner cylinder and the outer cylinder, which is formed by the elastic layer having slot-like pockets within the elastic layer or not being connected to the corresponding wall of the inner and/or outer cylinder in certain areas, but instead only lying loosely, and (c) at least one bypass space outside the bushing body for a liquid or gas as pressure medium, which is connected to the displacement space inside the bushing body via at least one connection opening in the wall of the inner cylinder of the bushing body and is supplied with the pressure medium by means of one or more lines, the pressure medium being forced out of the bypass space into the widening displacement space, so that the elastic layer is compressed and the bushing is widened over its entire periphery owing to the slots present, generating a uniform rotationally symmetrical pretensioning of the bushing, characterised in that (i) both the outer cylinder and the inner cylinder have slots arranged axially in the longitudinal direction distributed over the surfaces, and (ii) the at least one bypass space outside the bushing body is formed by a rigid or elastic separation or spacer sleeve or layer, which has cut-outs, channels or cavities which are connected to the at least one displacement space inside the bushing body for accommodation of the pressure medium, being located with a close fit between the inner cylinder of the bushing body and the shaft or axle in order to maintain a separation. (i) both the outer cylinder and the inner cylinder have slots arranged axially in the longitudinal direction distributed over the surfaces, and (ii) the at least one bypass space outside the bushing body is formed by a rigid or elastic separation or spacer sleeve or layer, which has cut-outs, channels or cavities which are connected to the at least one displacement space inside the bushing body for accommodation of the pressure medium, being located with a close fit between the inner cylinder of the bushing body and the shaft or axle in order to maintain a separation.