BMW F20 F21 Tension Strut Wishbone Track Arm M135i N55 Front Right O/S 6857330

BMW F20 F21 Tension Strut Wishbone Track Arm M135i N55 Front Right O/S is a component from the Wishbones and ball joints category, designed for the front suspension on the passenger side. Engineered as a factory component for the N55 engine version, it ensures precise wheel handling, driving stability, and predictable vehicle behavior during braking and acceleration.

Specifications and technical data

• SKU: 6857330
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6857330
• Substitutable numbers: 6857330, 31106857330
• Location on the vehicle: Front, Right
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the suspension

The presented wishbone is dedicated to the front axle on the right side in BMW 1 Series F20/F21 models in the M135i version with the N55 unit. As a guiding element in the multi-link system, it is responsible for:

• maintaining proper wheel geometry during straight-line driving and cornering,
• stable load transfer from the wheel hub to the body,
• controlling changes in toe and camber during suspension travel,
• reducing unwanted vibrations and play in the steering and suspension system.

Thanks to the appropriately selected structural rigidity, the wishbone supports the precise handling characteristic of BMW, which is important both in daily use and during dynamic driving.

Construction and technical characteristics

The front right wishbone in this model works with other multi-link suspension components to create a coherent system responsible for wheel guidance. Key design features include:

• an integrated ball joint ensuring smooth rotation and articulation in multiple planes,
• mounting points matched to the factory sockets in the steering knuckle and subframe,
• arm geometry adapted to the specific track width and suspension kinematics of the M135i.

This configuration allows for maintaining factory handling parameters while facilitating installation without the need for modifications or adaptations.

Benefits of using the original wishbone

Using the correct wishbone on the right side of the front axle translates into a number of practical benefits:

• Consistency with factory geometry – maintaining the manufacturer's specified suspension angles and handling characteristics.
• Reduction of excessive tire wear due to stable toe and camber.
• Better vehicle control during emergency braking and rapid lane changes.
• Reduction of play and knocking in the suspension, which improves acoustic comfort inside the cabin.

Replacing a worn component with the correct wishbone from the same design group is particularly important in higher-power cars such as the M135i, where the chassis system operates under greater load.

Component condition and service application

The offered wishbone is a used part, which allows for economical suspension repair while maintaining compliance with BMW factory specifications. This type of component is suitable both for standard replacement of worn parts and for restoring full functionality to the chassis system after mechanical damage.

Due to the nature of the wishbone's operation, it is recommended to perform a suspension geometry adjustment after installation to fully utilize its capabilities and ensure even tire wear.

Related components and technical knowledge

During suspension work, it is worth paying attention to the condition of other components in the wheel guidance group – especially other wishbones, ball joints, and mounting hardware. Consistent replacement of several worn parts in one area often yields better results than temporary repair of a single element.

To better understand the role of wishbones in the entire chassis system and the relationships between shock absorbers, wishbones, and stabilizers, the following guide article may be helpful: Suspension system – a comprehensive guide to shock absorbers, wishbones, and stabilizers.

If you are planning a comprehensive repair or upgrade of the front suspension area in your BMW and need other components from the same group, such as additional wishbones, ball joints, or mounting hardware, check the available parts in the BMW Wishbones and ball joints category.