Description
The BMW F30 F31 F32 Rear Wheel 18″ 8.5J ET47 M Star Spoke 400 is an M-series alloy wheel designed specifically for the rear axle of BMW 3 and 4 Series models. With precise fitting parameters and a robust construction, it offers a safe, aesthetic, and functional solution for discerning users. It’s an ideal choice for replacing a damaged wheel or for planned wheel set upgrades.
Specifications and technical data
- SKU: 7845881
- Mark: BMW (Genuine OE)
- Condition: New
- OEM Part Number: 7845881
- Substitutable numbers: 36117845881, 7845881
- Location on the vehicle: Rear
- Rim diameter: 18″
- Rim width: 8.5
- Offset (ET): 47
- Hole diameter: 120
- Number of holes: 5
- Rim material: Aluminium
- Category: Rims
Intended Use and BMW Fitment
The M Star Spoke 400 rear wheel has been developed to maintain the factory suspension geometry and proper vehicle handling. Its design dedicated to the rear axle ensures correct load distribution, stability at higher speeds, and predictable cornering behavior. The use of original mounting geometry allows for installation without modifications, preserving compatibility with factory drivetrain and braking system components.
Construction, Material, and Performance Parameters
This wheel belongs to the Wheels category and is made from a lightweight aluminum alloy, which helps reduce unsprung mass and improves suspension response to road imperfections. The material used provides good rim stiffness while maintaining a reasonable weight, translating to more precise handling and better vehicle feedback. The rim’s construction is designed to work with the typical BMW mounting system, ensuring secure wheel seating on the hub.
The wheel’s size, width, offset, diameter, and bolt pattern have been selected to maintain the correct track width, proper fender well fill, and optimal tire performance. This allows the wheel to work seamlessly with factory and recommended tire sizes, supporting vehicle stability in both daily driving and spirited performance.
Benefits of Using the M Star Spoke 400 Wheel
Using this rear wheel on your BMW offers a range of practical benefits:
- maintaining the vehicle’s factory handling characteristics and stability,
- a cohesive, sporty look characteristic of the M line,
- appropriate rim stiffness supporting steering system precision,
- compatibility with the factory BMW wheel mounting system,
- the ability to use recommended tire sizes without bodywork modifications.
For the user, this means confident handling, predictable vehicle behavior, and an aesthetic appearance that complements the styling of the F30, F31, and F32 models.
Application in Service, Repair, and Upgrades
The M Star Spoke 400 rear wheel is suitable as a replacement part for a damaged rim or for planned wheel set upgrades to a sportier configuration. By adhering to factory specifications, installation requires no additional adapters or suspension modifications, simplifying service work and reducing vehicle downtime. This solution is particularly beneficial for workshops and users who expect predictable results after wheel replacement.
More BMW Wheels and Technical Knowledge
If you are planning a comprehensive repair or upgrade of the running gear in your BMW and need other parts from the same group, such as additional rims, wheel sets, or wheels of different sizes, check the available parts in the BMW Wheels category.
If you are considering purchasing alloy wheels or want to better understand the process of refurbishing and preparing them for further use, consult the guide Used Wheels Like New: A Guide to Buying and Refurbishing Alloy Wheels, where you will find practical tips on assessing wheel condition and their refurbishment.
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