BMW Strut Cartridge - Bilstein Touring 21-031199

Product Information

A suspension strut cartridge is the internal shock-absorbing component housed within a strut assembly. It controls suspension movement by dampening the up-and-down motion of the springs, ensuring stability, comfort, and proper tire contact with the road. In some vehicles, the cartridge can be replaced separately without changing the entire strut housing.

• Excessive bouncing or poor ride comfort, as the cartridge can no longer dampen spring movement effectively.
• Nose-diving or body roll, especially during braking or cornering, due to weakened damping control.
• Fluid leaks or clunking noises, indicating internal seal failure or worn-out cartridge components.

About Bilstein B4 OE Replacement

Bilstein shocks and strut perform due to their larger piston area and quality manufacturing. Bilstein shocks eliminate dead spots, and deliver extremely responsive valving for superior performance and handling, including consistent, fade-free damping and shorter braking distance. Made only from the highest quality materials, Bilstein shocks reduced valve fatigue means they last much longer than standard stock replacement components. Bilstein Touring (B4): The Bilstein B4 Series provides the same OEM quality and ride stability for the aftermarket. Bilstein uses both monotube and twin-tube technology to give the best in OE replacement driving comfort at a great economical price. This class shock is considered by FCP to be a stock replacement or “one step up” from factory replacement shocks.

Features and Benefits

• Constant damping characteristics under any load
• Consistent performance and handling give the vehicle a new car feel every time
• Proven BILSTEIN gas pressure technology
• High OEM quality standards