E30 325i, E34 525i M20 Aluminum Lightweight Flywheel

BMW Fitments:
3 Series
E30 320is (82-93) 6-cyl.
E30 323i (81-86) 6-cyl.
E30 325i (Dec 86-93) M20
E30 325ix (Aug. 87-92) M20
5 Series
E34 520i (87-90) M20
E34 525i (87-90) M20
E34 520i (89-95) M50

Upgrade your E30 325i’s performance with the JB Racing Aluminum Lightweight Flywheel, which drastically reduces the heavy rotating mass of the stock flywheel. The result? Your engine revs faster, gear changes become smoother, and rev-matching feels nearly effortless.

Designed specifically for street-driven vehicles, JB Racing’s lightweight aluminum flywheels improve both responsiveness and efficiency. By cutting down on both static weight and rotational inertia (MOI), the engine requires less energy to spin the flywheel—meaning more power is transferred directly to the wheels.

Each flywheel is CNC-machined from high-quality billet aluminum in a single-mass design that mirrors the critical specs of the original factory unit. They are fully compatible with OEM clutch components* and are crafted with precision on advanced CNC machinery at JB Racing’s facility in the USA.

Known for their exceptional machining work, JB Racing is trusted by top-tier race teams across the country for engine and drivetrain components. Their BMW flywheels are built to the same rigorous standards that professionals depend on—offering far superior quality compared to typical aftermarket options.

Key Features:

• CNC-machined and precision zero-balanced to eliminate vibration

• Replaceable, bolted (not riveted) hardened steel clutch face

• Heli-coil pressure plate threads resist stripping during clutch swaps

• Factory-style starter ring gear

• Reinforced steel gaul plate prevents flywheel bolt damage

• Includes all hardware: flywheel bolts, pressure plate bolts, and 10mm captive dowel pins

• All metric pressure plate fasteners included

• Weighs just 8 lbs—half the weight of the OEM 16-lb flywheel

• Proudly made in the USA

Note: For best results and to minimize drivetrain noise and stress, we recommend pairing this flywheel with a sprung-hub clutch disc.