BMW Motorsport M2 CS Racing/M4 GT4 Rear Flange

By BMW Motorsport
From £398.00

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

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