Bilstein PSS9 Coilovers

Bilstein PSS9

The Bilstein PSS9 is a ride-height/damping adjustable, ultra-high performance suspension system (PSS) with performance coil-over/valved monotube gas shocks.

 The Bilstein PSS9 uses inverted monotubes, an upside-down, motorsport racing inspired design. The PSS9 shocks have patented digressive piston heads and deflective valving that instantly reacts to changing road conditions.


Bilstein PSS9
Bilstein PSS9

Bilstein PSS9 adjusters

The car's height can be set through a threaded ride height adjuster, from around 1"1/4 to 2" (20mm to 50 mm). The threaded body allows accurate adjustability of the front and rear progressive rate springs, for the accurate adjustment of your car's ride height, stance and cornering balance.

A thumb wheel on each shock absorber makes it possible to choose among 9 different compresion/rebound settings in addition to the base bump and rebound settings.

This combination of ride-heigth and damping force adjustments enables you to find the optimum setting for your car in all conditions.

Monotube design against heat build-up

Conventional twin-tube shocks tend to trap heat within the inner (pressure) tube as it is insulated from cooling air by the outer (reserve) tube, making them prone to heat builup and fade under hard use. The hydraulic fluid's viscosity changes with temperature: hot oil is "thinner" and circulates more easily than cold oil. To provide constant damping the fluid must maintain a constant viscosity, and this is accomplished by dissipating heat as fast as possible. The best way to accomplish this is by using a monotube design, exposed to the surrounding cooling air. 

Gas charged to minimize foaming

 The primary goal of gas charging is to minimize aeration (foaming) of the hydraulic fluid. The motion of the piston through the fluid creates an area of high pressure ahead of the piston, and an area of low pressure behind it. If the pressure gets too low (which happens when the piston moves up and down rapidly), the fluid in that area can spontaneously change to gas: tiny air bubbles can form (this phenomena is called cavitation). The resulting foaming of the hydraulic fluid causes extreme fade of the shock's damping ability because the resulting foam then offers little resistance to the piston.

The addition of pressurized gas helps to prevent cavitation and thus, reduces the chance of an eventual fade.

ThyssenKrupp Bilstein means High performance tuning

From racing and testing in Formula 1, NASCAR, SCCA, Rally, and Off Road to original equipment on BMW, Ferrari, Jaguar, Mercedes-Benz, Porsche, Subaru, Toyota and GM trucks, Bilstein has been a driving force in the automotive suspension industry for over 40 years.

Made in Germany, Bilstein's shock bodies are precision formed through a unique seamless extrusion process. This provides superior strength along with high finish tolerances that are usually associated with surgical instruments. The finished body is then mated with a solid, induction hardened steel chrome plated and polished shaft, machined valving components and highest quality seals.

Get a Bilstein PSS9 Kit

You can order a Bilstein PSS9 Kit from

You can use amazon's search bar to find the most adequate bilstein kit for your car model / year.

They can quickly deliver your kit almost anywhere in the world; all prices displayed are in $USD.

You liked this hub? Please rate it!

More by this Author

Click to Rate This Article