Spec 12-15 Mini Cooper S Single Mass (Unsprung) Aluminum Flywheel *For Use With Sprung Clutch Disc*

This SPEC single mass aluminum flywheel, part number SB09A-3, is precision-machined from a solid block of aircraft-grade aluminum. This material choice significantly reduces rotational mass compared to a stock dual-mass flywheel, which can lead to a more responsive engine and quicker acceleration. It's designed specifically for Mini Cooper S models from 2012-2015 and is intended for use with a sprung clutch disc, ensuring proper engagement and damping characteristics.

The single-mass design offers a more direct connection between the engine and the clutch, often resulting in a crisper feel during gear changes. Because it's unsprung, it relies on the clutch disc itself to absorb drivetrain shock, which is why it's crucial to pair it with a sprung disc. This setup is popular for drivers looking to shed weight from the rotating assembly and achieve a more immediate engine response, especially in performance-oriented applications. The aluminum construction also helps dissipate heat more effectively than heavier steel flywheels.

When installing this flywheel, remember that it's a critical component of your clutch system. Ensure all mating surfaces are clean and that you follow the manufacturer's recommended torque specifications for both the flywheel bolts and the clutch assembly. Because this is a lightweight, single-mass unit, you may notice a slightly different engine idle characteristic and a more direct engagement feel compared to a stock dual-mass flywheel.