Bilstein B4 OE Replacement Front Shock Absorber for BMW E30 — Part No. 21-030505
Upgrade your classic BMW E30 front suspension with the Bilstein B4 OE Replacement Front Shock Absorber, part number 21-030505. This front strut insert is a direct-fit, OE-quality gas pressure twin-tube damper designed to restore factory ride quality, stability, and handling. Ideal for daily driving and spirited road use, the Bilstein B4 brings your E30 back to how it should feel on the road with precise steering response and dependable damping control.
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Why choose Bilstein B4 for your BMW E30
- OE replacement performance for BMW E30 front axle with the trusted Bilstein B4 shock absorber
- Gas pressure technology for constant damping power under load and confident high-speed stability
- Twin-tube construction for comfort, control, and long-term durability
- High traction and precise handling to refresh your E30 steering feel and road holding
- Direct-fit strut insert for 51 mm housings with top pin and bottom plate mounting
- Built to high OE quality standards for an as-new driving experience
Key features
- High power reserves for maximum safety
- Optimum driving experience as on day one
- Constant damping power under any load
- High traction and precise handling thanks to Bilstein gas pressure technology
- Comprehensive coverage for popular BMW E30 models
Technical specifications
| Fitting position | Front axle |
| Shock absorber design | Suspension strut insert |
| Mounting type | Bottom plate, top pin |
| System | Twin-tube |
| Type | Gas pressure |
| Strut outside diameter | 51 mm |
| Part number | 21-030505 / BILSTEIN-21-030505 |
| Manufacturer | Bilstein |
| EAN | 4025258430870 |
| UPC | 651860430874 |
Compatibility — BMW E30 and more
This Bilstein B4 front shock absorber fits a wide range of BMW E30 models with 51 mm front strut housings. Typical coverage includes:
-
BMW 3 Series E30 Saloon and Coupe 09.1982 to 03.1992
- 316, 316i, 318i, 318is, 320i, 320is, 323i, 325i, 325e 2.7, 324td
-
BMW 3 Series E30 Touring 07.1987 to 10.1994
- 316i, 318i, 320i, 325i, 324td
-
BMW 3 Series E30 Convertible 09.1982 to 11.1993
- 316i Baur TC, 318i, 320i, 325i
-
BMW Z1 Roadster 06.1988 to 06.1991
- 2.5
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Real-world results from Nforcd
We supply and fit Bilstein B4 shock absorbers for BMW E30 owners who want factory-fresh ride quality with improved control. Our customers consistently report a tighter front end, better braking stability, and a comfortable yet confidence-inspiring drive. It is a proven, no-nonsense upgrade for restoring the E30 chassis feel.
Professional fitting and support
Want this fitted by specialists who know BMW E30 suspension inside out? Nforcd offers professional installation in Warwickshire. Request a fitting quote at Sales@nforcd.com and our team will be happy to help.
Compatibility check
To ensure the part fits your vehicle, we run a compatibility check prior to dispatch using your UK registration number or the last 7 digits of your VIN. Simply enter your car details prior to checkout.
In summary
If you are searching for a BMW E30 front shock absorber, E30 front damper, or Bilstein B4 OE replacement for 51 mm struts, the Bilstein 21-030505 is the go-to direct-fit solution. Restore your E30 ride, handling, and safety with trusted Bilstein quality from Nforcd.