Timken RET187 Wheel Bearing Retaining Ring - Rear

Wheel Bearing Retaining Ring for Mercedes-Benz

Timken RET187 is a wheel bearing retaining ring engineered to OEM specifications for secure rear and front axle service on select Mercedes-Benz applications. It is built for a precise fit that helps avoid scoring the bore during installation and removal.

Compatible With Mercedes-Benz S-Class and ML-Class fitments, this retaining ring supports clean, accurate wheel bearing retention where proper ring geometry matters. The Timken RET187 also uses a universal design with notches positioned for access with traditional snap ring pliers.

Key Features

• Engineered to OEM specifications for wheel bearing retention service
• Secure fit designed to avoid scoring the inside of the bore
• Universal design reduces notch configurations for easier installation
• Notches positioned for access with standard snap ring pliers
• Built to Timken quality standards
• Interchange reference: CIR187

Detailed Description

The Timken RET187 wheel bearing retaining ring is a direct-fit hardware component for rear Mercedes-Benz S350, S430, S500, S55 AMG, and S600 applications, plus front Mercedes-Benz ML320, ML430, ML500, ML55 AMG, and ML350 applications. It is intended for service work where the retaining ring must hold the wheel bearing securely while maintaining proper bore condition.

For technicians and DIY repair work on Mercedes-Benz S-Class and ML-Class vehicles, RET187 provides a practical OE-style replacement option with a design focused on fit, access, and repeatable installation. Part number RET187 is also referenced by CIR187.

What It Helps Address

• Loose or damaged wheel bearing retaining ring fitment
• Retaining ring removal and replacement during bearing service
• Installation issues caused by poor notch access
• Bore scoring from incorrect ring geometry
• Service needs on Mercedes-Benz rear and front wheel bearing assemblies

Installation Notes and Tips

Use traditional snap ring pliers that match the notch layout before removing or installing the ring. Inspect the bore and surrounding components for wear or damage before reassembly, and confirm the retaining ring seats fully in its groove after installation. Verify the application by year, model, and position before ordering RET187.

Quality Assurance

Timken manufactures this retaining ring to align with stringent quality standards and OEM-based specifications for consistent service fitment.