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?

• Genuine BMW Motorsport component, developed for GT4 and CS Racing models

• Reinforced flange design prevents hub-centric stress cracking

• Improves reliability in high-load and high-temperature conditions

• Maintains OEM geometry and fitment

• Perfect for endurance, sprint, and time-attack builds

Key Features

• Motorsport-grade forged and heat-treated steel construction

• Full-face hubcentric mounting surface for reduced stress concentration

• Direct OEM replacement – fits with standard BMW rear bearings

• Compatible with optional BMW Motorsport heavy-duty bearing

• Sold as a pair.

• Direct bolt-on installation, no modification required

Compatibility

• BMW F87 M2 Competition / CS

• BMW F80 M3

• BMW F82 / F83 M4

• BMW M2 CS Racing

• BMW M4 GT4

Recommended For

• Endurance and high-performance builds

• Track-prepared or competition-spec M2/M3/M4

• Preventative upgrade during drivetrain rebuilds or hub service

Important Notes

• Designed for motorsport use only – no manufacturer warranty

• Sold as a pair.

• Standard BMW rear bearing is compatible, though a BMW Motorsport bearing upgrade is also available for maximum endurance reliability

• Regular inspection is recommended during competitive use