BMW F30 F31 Rear Black Wheel Alloy Rim 18" 8,5J ET:47 M Star Spoke 400 7845881

Visual condition of the part 

The product shows signs of use visible in the photos. 

BMW F30 F31 Rear Black Wheel Alloy Rim 18" 8,5J ET:47 M Star Spoke 400 is an original rear light-alloy rim designed for 3 Series models, engineered for precise handling and stability. The aluminum construction, combined with a black finish, emphasizes the car's dynamic character, while the precisely selected geometric parameters ensure proper wheel fitment within the wheel arch. This is the ideal solution for users looking to maintain factory driving characteristics and a cohesive look for the rear axle.

Specifications and technical data

• SKU: 7845881-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7845881
• Substitutable numbers: 36117845881, 7845881
• Location on the vehicle: Rear
• Color: Black
• Rim diameter: 18"
• Rim width: 8.5
• Offset (ET): 47
• Hole diameter: 120
• Number of holes: 5
• Rim material: Aluminium
• Category: Rims

Purpose and fitment for BMW F30 / F31

The presented rim is configured as a rear axle component for BMW 3 Series F30/F31 models, meaning its geometry is tailored to factory suspension specifications. The appropriate rim width and offset promote stability at higher speeds and predictable vehicle behavior in corners. Thanks to the correct bolt pattern and center bore diameter, the rim is compatible with original hubs and mounting hardware, facilitating easy installation and maintenance.

Construction, material, and performance characteristics

The rim belongs to the Wheels category and is made of aluminum, which allows for a reduction in unsprung mass compared to steel solutions. A lighter rim promotes faster suspension response to road irregularities, improving both comfort and steering precision. The aluminum material also provides good structural rigidity, which translates into stable tire support and consistent vehicle behavior during dynamic driving.

The black finish of the rim creates a cohesive, technical look with the BMW F30/F31 body, blending well with both light and dark paint colors. This color optically highlights the rim diameter and gives the rear of the vehicle a more assertive, modern character, especially when combined with lower-profile tires.

Geometric parameters and driving properties

The rim diameter has been selected to work with typical tire sizes used on the BMW F30/F31, maintaining a balance between comfort and handling precision. The rim width allows for proper tire bead seating, which is important for lateral stability and predictable vehicle behavior during load changes. The applied offset ensures the correct wheel position relative to the wheel arch, which affects suspension geometry and the loads acting on bearings and chassis components.

The bolt pattern and number of mounting holes comply with the standard used by BMW, allowing for the use of factory bolts and mounting accessories. This configuration simplifies rim replacement in service conditions and minimizes the risk of compatibility issues.

Practical application and benefits of installation

Installing this rim on the rear axle of a BMW F30/F31 allows for maintaining the stylistic consistency and driving parameters intended by the manufacturer. This solution is particularly beneficial in situations where it is necessary to replace a single rim after mechanical damage or during a gradual wheel set upgrade. The aluminum construction promotes efficient heat dissipation from the brake area, which is important during intensive use.

The rim will perform well in both daily city driving and on the highway, providing stable tire support and predictable vehicle reactions. Maintaining original rim parameters is beneficial for the operation of assistance systems, such as electronic stability control or traction control systems, which rely on factory design assumptions.

If you are planning a comprehensive repair or upgrade of the wheel area in your BMW and need other items from the same group, such as additional rims, winter sets, or front axle sets, check out the available parts in the BMW Wheels category.

How to consciously buy used alloy wheels

When choosing a used alloy rim, it is worth paying attention to the compliance of parameters with vehicle manufacturer requirements, the condition of the working surfaces, and the possibility of potential refurbishment. A properly selected and correctly installed rim ensures driving safety and limits wear on tires and suspension components. For drivers who want to deepen their knowledge on selecting and refreshing rims, the guide Used wheels like new: a guide to buying and refurbishing alloy wheels, which discusses key technical and operational aspects, will be helpful.