Bilstein B4 OE Replacement Suspension Strut Cartridge

1989–1990 BMW 525i

Part #: 21-030246

Overview

The Bilstein B4 OE Replacement Suspension Strut Cartridge is designed to restore the original ride quality and handling characteristics of your BMW 525i from 1989 to 1990. Engineered with precision and backed by Bilstein's renowned reputation for quality and durability, these dampers provide a seamless replacement that maintains your vehicle’s factory performance. Whether you're restoring an aging suspension or seeking to uphold the factory standards, the B4 OE Replacement Strut Cartridge ensures your BMW drives like new.

Ideal for enthusiasts and daily drivers alike, these strut cartridges are perfect for maintaining the comfort, safety, and handling that your vehicle was designed to deliver. They are especially suited for those looking to replace worn-out components without sacrificing original ride quality or handling dynamics. With Bilstein's commitment to excellence, you can trust these dampers to provide consistent performance and long-lasting reliability.

Key Features

The Bilstein B4 OE Replacement Dampers incorporate advanced engineering and high-quality materials to deliver a factory-like driving experience. Here are some of the key features:

• Designed specifically for the 1989–1990 BMW 525i, ensuring perfect fitment and compatibility.
• OE-grade construction with high-quality steel and precision components for durability and longevity.
• Gas-pressure technology provides consistent damping performance, restoring original handling and ride comfort.
• Bilstein's proprietary monotube design offers improved heat dissipation and stability under various driving conditions.
• Engineered to meet or exceed OE standards, ensuring safety and reliability for daily driving and spirited driving alike.
• Maintains factory ride height and handling characteristics, making it an ideal choice for restoration or OEM replacement.
• Easy installation using factory mounting points, with no modifications required.
• Backed by Bilstein's reputation for quality and performance, ensuring peace of mind and long-term durability.

Construction & Design

The Bilstein B4 OE Replacement Strut Cartridge features a robust monotube design constructed from high-strength steel and corrosion-resistant materials. This design ensures consistent damping performance and excellent heat dissipation, which helps maintain optimal ride quality during extended driving. The cartridge is engineered to match the original equipment specifications, including dimensions and mounting points, guaranteeing a perfect fit and straightforward installation. The internal valving is calibrated to deliver the same damping characteristics as the factory units, preserving your vehicle’s handling and comfort.

Installation & Fitment

The Bilstein B4 OE Replacement Suspension Strut Cartridge is a direct bolt-on replacement for the original factory units. No cutting, drilling, or special modifications are required. The installation process is straightforward for those familiar with suspension work, and all mounting points are designed to match the OEM specifications. It is recommended to replace strut cartridges in pairs to ensure balanced handling and performance. For best results, professional installation is advised to ensure proper alignment and safety.

• Direct replacement for factory units on 1989–1990 BMW 525i
• No modifications, cutting, or drilling required
• Compatible with OEM mounting points and hardware
• Designed for easy installation with standard tools

What's Included

• One (1) Bilstein B4 OE Replacement Suspension Strut Cartridge
• Installation instructions (if applicable)

Ideal For

• Restoring original ride quality and handling of your BMW 525i
• Replacing worn or damaged suspension components
• Enthusiasts seeking OEM-level performance and durability
• Daily drivers and classic car restorers