Spec 15-19 BMW M140l Aluminum Flywheel

Unlock sharper throttle response, faster revs, and stronger, more consistent clutch performance with the SPEC-Design Single Mass Flywheel for BMW B58. Perfect for BMW M140i, M240i, 340i, and 440i owners looking for a lightweight flywheel and clutch upgrade that delivers on-road and track performance. This SPEC single mass flywheel is engineered for the B58 engine platform and is designed to work exclusively with SPEC-Design clutches. It features a non-SAC mechanism pressure plate setup for a lighter rotating assembly, higher rpm capability, and increased clamp load. The billet, rebuildable flywheel has a lightweight, low MOI design for rapid engine response and repeatable performance. The aluminum option shows exceptional gains, with up to 17 whp on an otherwise unmodified car, while the steel option shows around 10 whp and offers greater gear resonance damping, which is quieter at idle with the pedal out than aluminum. It is purpose-built for BMW B58 performance driving, track use, and fast-road builds. Important fitment note: This SPEC-designed single mass flywheel cannot be fitted to an OEM design clutch. It is for SPEC’s proprietary SPEC-Design clutch systems for the BMW N55 and B58 platforms. Professional fitting is recommended.