Spec Stage 1 Clutch Kit SAC SB551 – BMW 1M & N55 (E8x / E9x / F22 / F3x / F10)

OVERVIEW

The SPEC Stage 1 clutch kit uses a molded, high-performance organic lining that offers smooth engagement and excellent life. It is the one-step-up replacement for a tuned N55 that has outgrown the factory clutch, with SPEC's latest pressure plate technology and a material matrix that maximizes friction coefficient, wear life and engagement quality. SPEC recommends it for street, drag, drift, road racing, rally, pulling and autocross use.

This is the ratcheting (SAC) version, so it bolts to the OE dual mass flywheel or to a SPEC SB55S / SB55A billet single mass flywheel with the OE clutch pattern. Buy the kit on its own, or add the SPEC flywheel in the option above.

SPECS

• Stage 1 single disc clutch kit
• Friction material: molded high-performance organic lining
• Hub: double sprung, heat treated
• Pressure plate: SPEC high-clamp, self-ratcheting (SAC) design
• Character: smooth, near-stock engagement; SPEC lists street, drag, drift, road race, rally, pulling and autocross
• Flywheel requirement: runs on the OE dual mass flywheel or a SPEC SB55S / SB55A billet flywheel — a SPEC flywheel is optional

PARTS INCLUDED

• Pressure plate
• Clutch disc
• Pilot bearing
• Release (throwout) bearing
• Alignment tool
• With a flywheel option selected: SPEC SB55S steel or SB55A aluminum billet single mass flywheel with pressure-plate-to-flywheel bolts

TECH RESOURCES

Additional Parts Required

• None. This kit runs on the OE dual mass flywheel and includes its own pilot bearing, release bearing and alignment tool.
• Optional single mass flywheel (SAC pattern), also sold separately: SPEC SB55S steel or SPEC SB55A aluminum.
• If the OE dual mass flywheel is being reused it must be inspected and, where serviceable, resurfaced before the new clutch is fitted.
• Installer-supplied: transmission jack, new flywheel-to-crank bolts and BMW-specification transmission oil if the transmission is drained.

Installation

• SPEC does not publish a downloadable installation PDF for this application — follow the printed installation and break-in instructions supplied with the kit.
• Installation requires removal of the transmission and should be carried out by a qualified technician. Inspect the pilot bearing bore, clutch fork, release-bearing guide sleeve and slave cylinder while the transmission is out.
• Bed the clutch in with light, gradual engagements before applying full load.

Notes

• Non-ratcheting version (requires a SPEC “-2” flywheel): SB551-2.
• Manual-transmission cars only. Confirm fitment with Speed Logic before ordering.
• 2011+ Z4 sDrive35i (N54) uses SPEC's N55-family clutch kit and SB55S-2 / SB55A-2 flywheel.

PART NUMBER

• SB551
• SB55S
• SB55A

VEHICLE APPLICATIONS