Suplex 06231 Coil Spring - Rear

Rear Coil Spring for BMW Z4

The Suplex 06231 rear coil spring is a direct suspension component for 2003-2005 BMW Z4 models with Factory M-Sports Suspension. Built as a rear Mini Block spring, it is specified with a 229 mm length, 139 mm outer diameter, and variable thickness measurements of 10.4, 15.3, and 11.2 mm for the listed application.

Key Features

• Fits 2003-2005 BMW Z4, rear
• For vehicles with Factory M-Sports Suspension
• Rear coil spring with Mini Block spring design
• Part number 06231 for application matching
• Dimensions: 229 mm length, 139 mm outer diameter
• Spring thickness specifications: 10.4 mm, 15.3 mm, and 11.2 mm
• Brand line: SUPLEX suspension spring component

Detailed Description

Suplex 06231 is a rear coil spring engineered for the BMW Z4 platform in the 2003-2005 model years when equipped with Factory M-Sports Suspension. The SUPLEX product line focuses on suspension spring components, and this rear spring is identified by its Mini Block design and application-specific dimensions. If you are sourcing a BMW Z4 rear coil spring, part number 06231 provides a fitment-matched option for the listed suspension configuration.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What This Part Helps Address

• Rear ride height that has dropped from spring fatigue
• Uneven rear suspension stance on a BMW Z4
• Loss of spring support in Factory M-Sports Suspension setups
• Noisy or unstable rear suspension behavior caused by worn coil springs
• Restoration of rear spring rate and suspension geometry for the listed application

Installation Notes and Tips

Verify the vehicle is a 2003-2005 BMW Z4 with Factory M-Sports Suspension before ordering. Match the rear position and compare the spring dimensions and design to the original component during inspection. Because coil spring replacement affects suspension load and ride height, professional installation and a post-installation alignment are recommended.

Quality Assurance

Suplex suspension components are built for application-specific fitment, and part number 06231 is cataloged for the rear position on the listed BMW Z4 models. Confirm the suspension package and part number before installation to ensure correct application matching.