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Bilstein 21-030246 Suspension Strut Cartridge - Front
| Brand | Bilstein 21-030246 |
|---|---|
| Position | Front |
| Boot Included | No |
| Finish | Black paint |
| Internal Design | Twintube |
| Lower Mount Type | Base cup |
| Series | B4 oe replacement |
| Title | Bilstein shock absorbers |
| Upper Mount Type | Stem |
| Product line | B4 OE Replacement |
| Fits | BMW · 4 vehicles |
OE replacement. Restores original ride quality and handling while meeting OE standards.
Twintube design. Delivers consistent damping for a smooth, controlled ride.
Black paint finish. Adds a clean, durable protective coating.
Cross-references 31 32 1 134 565, 31 32 1 134 573 and 31 32 1 135 675 for the same application. See all 6.
Bilstein B4 Front Strut Cartridge for BMW
The Bilstein B4 OE Replacement suspension strut cartridge is built to restore original ride quality and handling on select BMW 525i and 535i models. This front suspension strut cartridge is engineered to meet or exceed OE standards while preserving the factory driving feel.
Part number 21-030246 is a direct-fit OE-style replacement for 1989-1990 BMW 525i and 535i front applications with the specified dust cap and nut requirements.
Key Features
- Bilstein B4 OE Replacement series
- Suspension strut cartridge for front installation
- Twintube internal design
- Black paint finish
- Upper mount type: stem
- Lower mount type: base cup
- Boot not included
- Built to maintain original ride quality and handling
Product Details
The Bilstein B4 OE Replacement line is focused on restoring factory suspension behavior rather than changing the vehicle’s character. For BMW 525i and BMW 535i owners, 21-030246 provides an OE-style front strut cartridge solution that supports consistent damping response and everyday drivability. This part cross-references Monroe Shocks & Struts 172286 for the same application.
Compatible With 1989 BMW 525i, front; 1989 BMW 535i, front; 1990 BMW 525i, front; and 1990 BMW 535i, front. Use notes apply: 1989 models require a 2.5 inch dust cap and 22mm nut, while 1990 models require a 2.5 inch dust cap and 19mm nut.
Common Issues This Part Can Address
- Excessive front-end bounce over rough pavement
- Reduced steering control from worn original dampers
- Uneven or unstable ride quality
- Noisy or loose-feeling front suspension response
- Loss of factory-like damping performance
Installation Notes
Verify the front application, dust cap size, and nut size before installation. This cartridge uses a stem upper mount and base cup lower mount, so confirm the existing suspension layout matches the vehicle notes. Professional installation and a post-installation alignment are recommended after replacing front suspension components.
Quality Assurance
Bilstein B4 OE Replacement dampers are engineered to meet or exceed OE standards and are backed by Bilstein’s established suspension manufacturing quality.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 1990 | BMW | 525i | Base | Front | Use with 2.5 inch dust cap and 19mm nut; B4 OE Replacement |
| 1990 | BMW | 535i | Base | Front | Use with 2.5 inch dust cap and 19mm nut; B4 OE Replacement |
| 1989 | BMW | 525i | Base | Front | Use with 2.5 inch dust cap and 22mm nut; B4 OE Replacement |
| 1989 | BMW | 535i | Base | Front | Use with 2.5 inch dust cap and 22mm nut; B4 OE Replacement |
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