Spec Stage 1 Clutch Kit Non-SAC SB551-2 – 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, 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 non-SAC version, built to run on a SPEC single mass flywheel. It is not compatible with the OEM dual mass flywheel, so a SPEC SB55S-2 or SB55A-2 flywheel must be fitted with it — add it in the option above, or choose “None” if you already have one.

SPECS

• Stage 1 single disc clutch kit
• Torque capacity: 430 ft-lbs (SPEC published)
• Friction material: molded high-performance organic lining
• Hub: double sprung, heat treated
• Pressure plate: SPEC high-clamp, non-ratcheting
• Character: smooth, near-stock engagement; SPEC lists street, drag, drift, road race, rally, pulling and autocross
• Flywheel requirement: single mass flywheel required — not compatible with the OEM dual mass flywheel

PARTS INCLUDED

• Pressure plate
• Clutch disc
• Pilot bearing
• Release (throwout) bearing
• Alignment tool
• With a flywheel option selected: SPEC SB55S-2 steel or SB55A-2 aluminum billet single mass flywheel with pressure-plate-to-flywheel bolts

TECH RESOURCES

Additional Parts Required

• SPEC single mass flywheel — REQUIRED. Select it in the option above, or buy separately: SPEC SB55S-2 steel or SPEC SB55A-2 aluminum. This kit will not run on the OEM dual mass flywheel.
• Pilot bearing, release bearing and alignment tool are included in the kit.
• Installer-supplied: transmission jack, new flywheel-to-crank bolts and BMW-specification transmission oil if the transmission is drained.
• When switching to a single mass flywheel some flywheel chatter or rattle is to be expected.

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

• Ratcheting / SAC version (runs on the OE dual mass flywheel): SB551.
• Steel is the better flywheel choice for a car that still sees daily traffic; aluminum is lighter but transmits more noise and makes smooth low-speed starts harder.
• 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

• SB551-2
• SB55S-2
• SB55A-2

VEHICLE APPLICATIONS