520-190-240

JB Racing Aluminum Lightweight Flywheel – E46 330i 6MT 3/03+, E85 Z4 3.0i

BMW Fitments:

3 Series
E46 (99-05) > 330Ci
E46 (99-05) > 330i
Z Series
E85 / E86 Z4 (03-08) > Z4 3.0i M54

Drop serious weight and gain quicker engine response with the JB Racing Aluminum Lightweight Flywheel. Specifically engineered for the 6-speed E46 330i and compatible Z4 3.0i models, this flywheel replaces the heavy factory unit to significantly reduce rotating mass. The result is faster revs, quicker shifting, and smoother rev-matching—ideal for drivers who want sharper throttle response.

Designed for high-performance street use, this flywheel reduces both overall weight and Moment of Inertia (MOI), meaning your engine spends less energy spinning the flywheel and more energy powering your wheels.

Precision-crafted from billet aluminum, each JB Racing flywheel is a single-mass design that replicates the key dimensions of the OEM unit—allowing seamless use of factory clutch components.* All machining, balancing, and assembly are done in-house at JB Racing’s state-of-the-art U.S. facility, trusted by pro race teams nationwide.

Key Features:

• CNC-machined and zero-balanced for smooth operation

• Bolted-on, replaceable hardened steel clutch surface (no rivets)

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

• Compatible with OEM or aftermarket sport clutches*

• Includes factory-spec starter ring gear

• Hardened steel gall plate protects flywheel bolt interface

• Comes with flywheel bolts, pressure plate bolts, and captive 10mm dowel pins

• Pilot bearing pre-installed in the hub

• All hardware is metric

• Weighs just 10.5 lbs compared to the stock 25 lbs

• Proudly made in the USA

Clutch Compatibility Note: For best drivability and minimal noise, always pair with a sprung-hub clutch disc. *Not compatible with Clutch Masters 6-speed clutch kits (prefix 03CM3).