Spec Clutch SB552-2 Stage 2 Performance Clutch Kit BMW N55 B58 Non-Ratcheting

The SPEC SB552-2 Stage 2 Performance Clutch Kit is a non-ratcheting clutch assembly engineered specifically for BMW vehicles equipped with N55 and B58 engines. This proprietary clutch kit is designed exclusively for use with SPEC billet steel (SBB58S-2) or billet aluminum (SBB58A-2) flywheels, providing enhanced performance for street, drag, pulling, and autocross applications.

Key Features:

• Segmented or full-faced pure Kevlar friction disc with steel backing for superior heat resistance and durability
• High clamp pressure plate delivers increased torque capacity while maintaining excellent drivability
• Double-sprung hub with spring cover relieves for flexibility and vibration dampening
• Heat-treated components throughout for maximum strength and longevity
• SFI approved for safety and quality assurance
• Torque capacity up to 485 lb-ft at the flywheel
• Designed, hand-built, and tested in the USA

The Stage 2 design offers excellent drivability similar to Stage 1 clutches but with significantly longer service life and higher torque capacity. The pure Kevlar friction material provides smooth, chatter-free engagement ideal for modified naturally aspirated and forced induction engines while remaining civil enough for daily driving. The sprung hub design reduces drivetrain shock and enhances comfort during normal street use.

Important: This is a non-ratcheting kit that requires a SPEC billet flywheel (SBB58S-2 or SBB58A-2). The existing flywheel must be resurfaced or replaced prior to installation to ensure proper friction surface integrity and optimal clutch performance.