Spec 97-03 BMW 540 E39 4.4L Aluminum Flywheel

SPEC Flywheels are CNC manufactured at an unheard-of .001 tolerance, ensuring perfect balance and a perfectly flat bedding surface for the clutch disc, which contributes to safety in competitive environments. All SPEC flywheels are SFI certified. The flywheel's contribution to power transfer is three-fold: providing a consistent, friction-enhancing surface for the clutch disc, aiding in proper inertia (determined by weight), and providing true balance at RPM to prevent engine-damaging vibrations. SPEC flywheels are made from high carbon billet steel and aircraft quality billet aluminum, offering light and medium weight options for various racing types. Aluminum and most steel SPEC units are rebuildable and feature a replaceable steel friction plate formulated for optimum clutch bedding and holding power. SPEC optimizes MOI (moment of inertia) to maximize car output and performance.