BMW G20 G21 Guiding Suspension Control Arm Rear Right O/S 6878632

BMW G20 G21 Guiding Suspension Control Arm Rear Right O/S is a component from the Control arms and ball joints group, designed for the rear right suspension in BMW G20/G21 series vehicles. This is a used, original structural part that allows for restoring proper suspension geometry and stable vehicle handling after maintenance or accident repairs.

Specifications and technical data

• SKU: 6878632
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6878632
• Substitutable numbers: 6878632, 33326878632
• Location on the vehicle: Rear, Right
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the BMW G20/G21 suspension

The presented control arm operates on the rear axle on the right side, responsible for precise wheel guidance and maintaining the specified toe and camber angles. As a component of the multi-link system in the BMW G20/G21, it works in conjunction with other arms and ball joints, transferring loads from the wheel to the chassis and stabilizing the vehicle during acceleration, braking, and cornering.

Thanks to its factory design, the control arm ensures:

• appropriate rigidity while maintaining the required suspension flexibility,
• correct wheel guidance throughout the entire range of travel,
• stable vehicle behavior at higher speeds.

Benefits of using an original BMW control arm

The original rear right control arm for the BMW G20/G21 is designed for a specific platform, which translates into precise fitment to mounting points and predictable performance within the entire suspension system. Using parts from the same design group minimizes the risk of geometry issues, uneven tire wear, or improper ball joint operation.

In practice, this means:

• easier geometry adjustment after installation,
• consistent vehicle behavior in line with the manufacturer's factory specifications,
• preservation of the comfort and handling characteristics typical of BMW.

Condition, origin, and service application

The element comes from the BMW group and is classified as used, which allows for economical repair while maintaining the original structural specification. This type of control arm is suitable both for standard replacement of worn suspension components and for post-collision repairs, where it is necessary to restore the correct alignment of the rear axle on the right side.

The control arm can be used as a replacement for the factory-installed arm in situations where:

• play has been detected in the ball joints or bushings,
• the arm has been mechanically bent,
• rear axle geometry cannot be adjusted within the range specified by the manufacturer.

Professional installation and operation

Due to its importance for driving safety, the installation of the rear right control arm in a BMW G20/G21 should be performed professionally, adhering to the manufacturer's tightening torques and procedures. After replacement, it is recommended to perform a full suspension geometry adjustment to fully utilize the properties of the multi-link system and avoid accelerated tire wear.

For users who want to better understand how the suspension works and the relationships between control arms, shock absorbers, and stabilizers, the following guide will be helpful: Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers.

Expanding the repair within the BMW suspension

If you are planning a comprehensive repair or upgrade of the suspension area in your BMW and need other elements from the same group, such as additional control arms, ball joints, or mounting hardware, check out the available parts in the BMW Control arms and ball joints category.