Spec Stage 2+ Clutch Kit Non-SAC 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 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 2+ single disc clutch kit
• Torque capacity: 545 ft-lbs (SPEC published)
• Friction material: multi-friction full-faced disc — carbon semi-metallic on one side, Kevlar on the other
• Hub: high-torque double sprung hub with spring cover relieves, heat treated
• Pressure plate: SPEC high-clamp, non-ratcheting
• Character: street drivable; SPEC lists street, drag, autocross, road racing, pulling, rally and drift
• 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): SB553H.
• 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

• SB553H-2
• SB55S-2
• SB55A-2

VEHICLE APPLICATIONS