E39 M5 Aluminum Lightweight Flywheel

BMW Fitments

Upgrade your 6/96–‘03 E39 540 with the JB Racing Aluminum Lightweight Flywheel and experience a dramatic reduction in rotating mass compared to the factory unit. This drop in weight allows the engine to rev faster, improving throttle response, speeding up gear changes, and making rev-matching a breeze.

Engineered specifically for street performance, JB Racing’s aluminum flywheels reduce both static weight and Moment of Inertia (MOI), meaning less power is needed to spin the flywheel—so more of it goes directly to the wheels.

Crafted from billet aluminum and designed as single-mass units, these flywheels precisely match OEM dimensions and are fully compatible with original clutch components.* Each flywheel is CNC-machined, balanced, and inspected in-house at JB Racing’s state-of-the-art facility.

Trusted by professional race teams across the country, JB Racing is known for their meticulous machining and race-proven quality. Their BMW flywheels reflect the same precision and craftsmanship demanded by elite motorsports teams—far beyond what you’ll find in typical aftermarket options.

Key features include:

• Precision CNC-machined and zero-balanced to prevent vibration
• Replaceable hardened steel clutch face, bolted (not riveted)
• Heli-coil inserts to prevent thread stripping during clutch changes
• OEM-style starter ring gear
• Hardened steel gaul plate to protect flywheel bolt surfaces
• Includes flywheel bolts, pressure plate bolts, and dowel pins
• Captive 10mm dowel pins for secure alignment
• All metric pressure plate hardware
• Weighs just 13 lbs vs. 38 lbs stock
• Proudly made in the USA