Spec Twin Disc Clutch Kit – BMW M3 / M4 (F80/F82)

OVERVIEW

The SPEC Super Twin is an all-billet twin disc clutch and flywheel assembly. The assemblies are smooth and quiet, constructed from aircraft-grade aluminium and high-carbon billet steel milled to an industry-leading .001 in. tolerance for perfect balance and actuation. Friction is provided by dampened, full-faced carbon-graphite discs.

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
• All-billet construction — aircraft-grade aluminium and high-carbon billet steel
• Milled to a .001 in. tolerance for balance and actuation
• Friction: dampened, full-faced carbon-graphite discs
• Trims offered on this listing: SS-Trim, P-Trim and ST Trim
• Organic, fiber and full-metallic disc versions are also available from SPEC
• 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
• Complete kit as supplied by SPEC; see the installation instructions for the full bill of materials.

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 gearbox 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 gearbox 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.

PART NUMBER

• SS-Trim: SB55SST-8.5
• P-Trim: SB55PT-8.5
• ST Trim: SB55ST

VEHICLE APPLICATIONS