Spec Super Twin Clutch Kit – BMW M3 / M4 (F8x, S55) & M2 (F87)

OVERVIEW

The SPEC Super Twin is an all-billet twin disc clutch and flywheel assembly for street and track use in cars with extreme horsepower and torque. The assemblies are smooth and quiet, constructed from aircraft-grade aluminum and high-carbon billet steel milled to an industry-leading .001 in. tolerance for perfect balance and actuation, and offer near-stock drivability with a no-shimming, bolt-in installation and maintenance-free operation.

The kits are rebuildable by SPEC or by the end user and replacement components are always available. The flywheel and track-spec hardware are included in each kit. SPEC rates the Super Twin for street, drag racing, drifting, road racing, time-attack, pulling and rally use.

SPECS

• Twin disc (multi-disc) clutch and flywheel assembly
• SS-Trim (SB55SST-8.5): 950 ft-lbs torque capacity (SPEC published)
• P-Trim (SB55PT-8.5): hybrid Kevlar / semi-metallic puck discs
• ST Trim (SB55ST): 1200 ft-lbs torque capacity (SPEC published)
• All-billet construction — aircraft-grade aluminum and high-carbon billet steel, milled to a .001 in. tolerance
• Flywheel and track-spec hardware included in each kit
• Rebuildable by SPEC or by the end user; replacement components always available

PARTS INCLUDED

• Twin disc clutch assembly (pressure plate, floater, two discs)
• Billet flywheel
• Track-spec hardware

TECH RESOURCES

Additional Parts Required

• None. The flywheel and track-spec hardware are supplied in the kit, so no separate flywheel purchase is needed.
• Installer-supplied: transmission jack, new flywheel-to-crank bolts and BMW-specification transmission oil if the transmission is drained.
• SPEC states the Super Twin is a no-shimming, bolt-in installation with maintenance-free operation.

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

• Part number varies by trim — select the trim on this listing. Confirm trim choice with Speed Logic if you are unsure which suits your power level.
• Manual-transmission cars only; DCT cars are not applicable.
• Twin-disc clutches rattle at idle with the pedal up. This is normal and is not a fault.

PART NUMBER

• SB55SST-8.5
• SB55PT-8.5
• SB55ST

VEHICLE APPLICATIONS