This is the most traditional and famous shock absorber configuration.
Thanks to its simplicity and versatility, it can be widely used, from the city car to heavy vehicles.
The range is structured in standard “sizes” in order to optimise weight and cost. Usually, the diameter of the internal pressure tube identifies the “size”.
The double-tube shock absorber consists of two concentric tubes.
The space between them is partially taken up by nitrogen in order to compensate the stem volume in its telescopic movements carried out by the suspension. This type of shock absorber features a minimum fixed axial dimension and allows a high flexibility in defining the dampening characteristics.
The presence of low-pressure nitrogen minimises the cavitation phenomena and the formation of emulsion, resulting in an excellent performance in the main rear suspension applications.
This configuration features high design and installation flexibility, with a wide range of fixing systems for installation on the vehicle.