Spec Stage 2+ Clutch Kit & Flywheel SB553H-2 – BMW 1M & N55 (E8x / E9x / F22 / F3x / F10)

OVERVIEW

The SPEC Stage 2 PLUS clutch kit uses a multi-friction disc in a full-faced configuration, carbon semi-metallic on one side and Kevlar on the other. Bridging the gap between Stage 2 and Stage 3, the 2+ keeps the drivability and engagement quality of the Stage 2 but carries 15–20% more torque capacity. The hub is double sprung with spring cover relieves for flexibility and the components are heat treated for strength and durability. SPEC recommends it for street, drag, autocross, road racing, pulling, rally and drift use.

This listing is the complete package: the SPEC Stage 2+ non-SAC clutch kit together with a SPEC billet single mass flywheel, in your choice of steel or aluminum. It does not fit the OE dual mass flywheel — the SPEC flywheel must be used.

SPECS

• Stage 2+ single disc clutch kit supplied with a SPEC billet single mass flywheel — steel (SB55S-2) or aluminum (SB55A-2)
• Torque capacity: 545 ft-lbs
• Friction material: multi-friction full-faced disc — carbon semi-metallic on one side, Kevlar on the other
• Torque capacity is 15–20% above the SPEC Stage 2
• Hub: high-torque double sprung hub with spring cover relieves, heat treated
• Pressure plate: SPEC high-clamp
• Flywheel: SPEC SB55S-2 high-carbon billet steel or SB55A-2 billet aluminum single mass, CNC machined to a .001 in. tolerance and SFI certified
• Flywheel requirement: does not fit the OE dual mass flywheel — the SPEC flywheel supplied with this package must be used

PARTS INCLUDED

• SPEC Stage 2+ pressure plate
• SPEC Stage 2+ clutch disc
• Pilot bearing
• Release (throwout) bearing
• Alignment tool
• SPEC SB55S-2 steel or SB55A-2 aluminum billet single mass flywheel, as selected
• Pressure-plate-to-flywheel bolts
• SPEC clutch kits supplied for use with a SPEC flywheel include pressure plate, disc, pilot bearing, release bearing and alignment tool.

TECH RESOURCES

Additional Parts Required

• None. The required SPEC single mass flywheel is already included in this package — choose steel or aluminum by variant.
• 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

• Aluminum is lighter than steel but transmits more noise and makes smooth low-speed starts harder — steel is the better choice for a car that still sees daily traffic.
• Clutch kit only (no flywheel) is sold separately as SB553H-2.
• 2011+ Z4 sDrive35i (N54) uses SPEC's N55-family clutch kit and SB55S-2 / SB55A-2 flywheel.

PART NUMBER

• SB553H-2
• SB55S-2
• SB55A-2

VEHICLE APPLICATIONS