BMW Motorsport M2 CS Racing/M4 GT4 Rear Flange
Product Description
Motorsport-Developed Rear Hub Upgrade for Endurance Strength and Reliability
The BMW Motorsport Rear Flange Hub Upgrade is a factory-engineered component designed to handle the extreme demands of endurance and competition use. Originally developed for the M2 CS Racing and M4 GT4, this upgraded hub flange features a thicker, full-face hubcentric design, providing enhanced durability and reduced stress compared to the lightweight OE version found on standard F8X models.
During long, high-load track sessions, the original hub design can develop stress cracks around the outer hubcentric surface — particularly under endurance racing conditions. The Motorsport version addresses this by increasing material thickness and reinforcing the contact surface, distributing load more effectively to ensure consistent reliability.
Why Upgrade?
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Genuine BMW Motorsport component, developed for GT4 and CS Racing models
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Reinforced flange design prevents hub-centric stress cracking
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Improves reliability in high-load and high-temperature conditions
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Maintains OEM geometry and fitment
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Perfect for endurance, sprint, and time-attack builds
Key Features
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Motorsport-grade forged and heat-treated steel construction
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Full-face hubcentric mounting surface for reduced stress concentration
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Direct OEM replacement – fits with standard BMW rear bearings
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Compatible with optional BMW Motorsport heavy-duty bearing
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Sold as a pair.
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Direct bolt-on installation, no modification required
Compatibility
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BMW F87 M2 Competition / CS
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BMW F80 M3
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BMW F82 / F83 M4
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BMW M2 CS Racing
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BMW M4 GT4
Recommended For
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Endurance and high-performance builds
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Track-prepared or competition-spec M2/M3/M4
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Preventative upgrade during drivetrain rebuilds or hub service
Important Notes
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Designed for motorsport use only – no manufacturer warranty
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Sold as a pair.
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Standard BMW rear bearing is compatible, though a BMW Motorsport bearing upgrade is also available for maximum endurance reliability
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Regular inspection is recommended during competitive use
Shipping & Delivery
Dispatch Times
Most stocked items dispatch within 1–2 business days. Some products may have longer lead times due to special ordering, availability, or build times. If your order contains multiple items, they may be shipped together once all items are ready unless otherwise agreed.
UK & International Shipping
We ship worldwide. Transit times vary depending on destination and courier. Tracking details are provided once your order is dispatched.
Import Duties & International Orders
International customers are responsible for all import duties, taxes, and clearance fees. These are not included in our prices and are outside of our control. Refusal or non-payment of import charges may result in return shipping, handling fees, and customs charges being deducted from any refund.
Damaged Shipments
If your parcel arrives visibly damaged, please refuse delivery or note the damage with the courier. If damage is discovered after opening, contact us immediately with photos. Do not install damaged items, as installation voids courier claims and return eligibility.
Returns
Returns must be authorised before sending anything back. Returns must be requested within 14 days of delivery and returned within 14 days of approval, in unused/uninstalled condition and in original packaging. Some items, including special-order, built-to-order, used, installed, or modified parts, are non-returnable.
Full details are available in our Shipping Policy and Returns & Refund Policy.
Warranty & Disclaimer
Warranty
Most products include a manufacturer’s warranty covering manufacturing defects only. Warranties do not cover wear and tear, improper installation, misuse or neglect, track use, competition or racing environments, labour costs, vehicle damage, downtime, or consequential loss. Warranty outcomes are determined by the manufacturer, not Clubsport Garage. Items must be returned for inspection at the customer’s cost unless agreed otherwise.
Fitment & Installation
Many products are aftermarket components and may require professional installation or minor adjustment. Perfect OEM-level fitment cannot be guaranteed. Professional installation by an experienced workshop is strongly recommended. Installed or used items cannot be returned.
Motorsport Use Disclaimer
Some products are intended for off-road, track, or motorsport use only and may not be legal for road use, for example non-TÜV/DOT-approved parts. It is the customer’s responsibility to ensure compliance with local laws, insurance requirements, and vehicle regulations. By purchasing and installing aftermarket parts, you accept all responsibility for ensuring compatibility, legal compliance, proper installation, and any resulting wear, damage, or failure.
Product Images & Descriptions
Product photos are illustrative and may differ slightly from the item supplied. If specific details are important, please contact us before purchasing.
Full details are available in our Terms of Service and related policy pages.
