PU Flex Disc / Driveshaft Coupler for BMW E30 E36 E46 E39

High-Performance Upgrade – T6061 Aluminum and Polyurethane – 85 Shore

This upgraded PU flex disc is designed for modified and high-torque BMW applications. It replaces the OEM rubber guibo with a precision-engineered solution that combines CNC-machined T6061 aluminum and a durable polyurethane insert, offering significantly improved stiffness, response, and long-term durability.

Factory rubber couplers tend to flex, crack, or fail under the stress of increased torque, high RPM, and aggressive shifting. Our performance disc eliminates these issues by resisting deformation, reducing driveline play, and delivering more direct power transfer to the driveshaft – especially in tuned or race-prepped vehicles.

Advantages at a Glance

• Higher torsional rigidity than OEM rubber
• Minimizes driveline slop and power delay
• Improved throttle and shift response under load
• Polyurethane insert reduces harshness vs. solid-metal solutions
• Resistant to heat, oil, and long-term fatigue
• Ideal for track, drift, time attack, or street-tuned cars

Technical Specifications

• Compatible with: BMW E30, E36, E46, E39 using M12 bolts
• Bolt circle: 78 mm
• Material: T6061 aluminum body, polyurethane bushing
• Shore hardness: 85 A – firm and performance-focused
• Recommended torque range: up to ~650 Nm
• Weight: lightweight vs. OEM and steel designs

Recommended Use Cases

Best suited for turbocharged builds, drift cars, supercharged applications, short-shifted setups, and cars with upgraded engine or transmission mounts. Offers excellent control and driveline response for serious performance enthusiasts.

Installation Notes

Professional installation is strongly recommended. Proper drivetrain alignment and torque specs are critical. Slight increases in NVH (noise, vibration, harshness) may be noticed, depending on the rest of the drivetrain setup.

Disclaimer

For motorsport and off-road use only. Not approved for road use under DOT or TÜV regulations. Use at your own risk.