BMW G20 G21 G22 Rear Suspension Control Arm Wishbone Left Right N/O/S 6878633

The Rear Suspension Control Arm for BMW G20/G21/G22 is an original part from the Control Arms and Ball Joints group, designed for operation on the left or right side of the rear axle. This used OEM part ensures factory suspension geometry, precise wheel guidance, and predictable vehicle behavior during everyday and more dynamic driving.

Specifications and technical data

• SKU: 6878633
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6878633
• Substitutable numbers: 6878633, 33326878633, 6878632, 33326878632
• Location on the vehicle: Rear, Right, Left
• Part type: Control Arm & Ball Joint Assembly
• Category: Control Arms, Ball Joints & Assemblies

Purpose and Function in Suspension

The control arm presented is a component of the rear suspension for BMW 3 and 4 Series G generation models (G20, G21, G22), responsible for stable wheel guidance and maintaining proper toe and suspension angles. Installation on the rear axle, left or right side, allows for flexible use of the part in single-sided repairs or symmetrical replacement of a pair of control arms.

Thanks to its construction conforming to factory BMW standards, the control arm works with other elements of the drivetrain, limiting unwanted wheel movement, improving traction, and the predictability of the car's reactions during braking, acceleration, and cornering.

Benefits of Using an Original BMW Control Arm

Using an original control arm from the Control Arms and Ball Joints group in a BMW G20/G21/G22 translates into a number of practical advantages:

• maintaining factory handling characteristics and driving comfort,
• proper load transfer in the rear suspension,
• better cooperation with the stock shock absorbers, springs, and stabilizer bar,
• reducing excessive tire wear resulting from incorrect geometry.

A used OEM part is a cost-effective solution that is also technically consistent with the vehicle's design, facilitating diagnostics and subsequent geometry adjustments after installation.

Professional Installation and Diagnostics

To fully utilize the potential of this control arm, installation in a specialized service center is recommended, using appropriate tools for multi-link suspension work. After replacement, it is advisable to perform:

• a check of other rear suspension components,
• rear axle wheel alignment adjustment,
• a test drive to verify track stability.

This approach minimizes the risk of uneven tire wear and improves safety in everyday car use.

Technical Support and Part Selection

If you want to better understand the operation of your BMW's suspension and the impact of control arms on safety and comfort, consult the advice in the article Suspension System – A Comprehensive Guide to Shock Absorbers, Control Arms, and Stabilizer Bars, which discusses practical aspects of operating and diagnosing these components.

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