ERS springs

Eibach ERS springs are the world's best motorsport spring system. Eibach Motorsport offers more than 1,300 individual components between main and secondary springs to configure the set-up of the car.

Two (or even three) ERS springs with different stiffness coefficients can be stacked, or a main spring with a secondary spring (linear or progressive) to achieve the most suitable set-up for each modality and car.

How the ERS system works. Initially, the main spring and the secondary spring are compressed simultaneously; the result is a softer initial characteristic (depending on the type of secondary spring, dual-rate or progressive). After the secondary spring has closed, only the main spring is compressed further, thus achieving the desired stiffer characteristic in the final range of the characteristic curve.

The part references for springs consist of the modular group (ERS), an internal code, the spring length in mm, the internal diameter in mm and the spring stiffness coefficient in N/mm.

Example: 0140-060-240

Length 140mm

Inner diameter 60 mm

Stiffness coefficient 240 N/mm.

Tender Spring. The secondary spring is a special development of a trapezoidal material that can withstand continuous full compression. The secondary spring increases the extension travel and makes the response more sensitive. The secondary springs are available with linear and progressive characteristic curves. Using standard elements, the characteristic curve travel can be designed as dual-linear (dual-rate) or with a progressive initial ratio and a linear final ratio to meet individual requirements.

In combination with the main springs, a progressive characteristic curve is achieved for the overall system. The low initial stiffness coefficient results from the combination of the main spring and the secondary spring, the final coefficient is identical to the stiffness coefficient of the main spring.

In the case of the secondary spring part number, the first number of the part number does not indicate the spring length in mm, but the travel in mm that the spring travels until it reaches the fully compressed state. The secondary spring 0050-060-0030 therefore has a spring travel of 50 mm, an inner diameter of 60 mm and a stiffness coefficient of 30 N/mm. The advantage of this specification is that the closing force of the secondary spring can be directly identified from this information as a result of the spring travel and the stiffness coefficient. In this example, therefore, 50 mm x 30 N/mm = 1500 N. When this force is reached, the change from the initial ratio to the final ratio takes place.

We can only offer the European ERS range, for inch measurements or different diameters you must contact Eibach UK/USA.