Spec 15-19 BMW M2/13-19 BMW M3 S55/M4 SS-Trim Twin Disc Clutch Kit
The S55 twin-turbo six in the F80 M3 and F82 M4 gains torque fast with a tune, downpipes or upgraded turbos, and the factory six-speed clutch runs out of capacity well before the engine does. If your manual M3 or M4 slips in the upper gears, the engagement point has climbed, or you are building past 600 ft-lb and want a clutch that still drives like a road car, SPEC SB55SST is the SS-Trim (organic) version of SPEC's Super Twin. SPEC lists it at 950 ft-lb of torque capacity and 44 lb as an assembly.
A twin disc spreads the clamping force of one pressure plate across two friction discs, so the clutch holds far more torque without needing a brutally stiff diaphragm spring or a larger diameter that will not fit the bellhousing. SPEC builds the Super Twin for street and track cars in the 700-1500 ft-lb range and describes it as offering near-stock drivability, long life, a bolt-in installation with no shimming or setup, and maintenance-free operation. This kit uses organic friction, which generally engages more progressively than ceramic or metallic material, and that matters on an M car that still sees commuting, valet parking and stop-and-go traffic. At 950 ft-lb rated capacity, it leaves room for a big-turbo S55 build without moving to a race-only clutch.
Log a wide-open pull in fourth and compare engine speed to road speed; a clutch that slips shows rpm climbing ahead of the car. Check the clutch hydraulics before condemning the clutch, because a leaking slave or a pedal that does not fully return causes poor release and grinding that feels like wear. Our slipping diagnosis guide covers how to separate clutch slip from other causes, and the manual vs automatic repair cost guide gives you a realistic idea of shop labor on a clutch job.
SPEC lists SB55SST for the BMW M3 (F8x) with the S55 engine (2012-2019 on SPEC's chart), the M4 (F8x, 2013-2019) and the M2 (2015-2019). It is for six-speed manual cars only: M3 and M4 models with the seven-speed DCT do not use a conventional clutch and cannot take this kit. BMW used more than one engine across M2 production, so M2 owners in particular should confirm their engine code before ordering. Send us your year and VIN and we will match it to SPEC's catalog before it ships. To compare other S55 options, see the Clutch Masters FX1000 race twin for F80/F82 or browse our clutch and rebuild kits.
Supporting the exhaust and driveshaft and dropping the six-speed is the bulk of the labor. Clean the crank flange, use new bolts where the instructions call for them and torque them in sequence. Because the Super Twin is a no-shim, bolt-in design, there is no stack-height measurement to do, but follow SPEC's instructions for assembly order and bolt torque exactly. Inspect the slave cylinder and release fork at the same time, lightly lube the input spline, and bleed the clutch hydraulics with fresh fluid of the type marked on the reservoir. Bed the organic discs in with gentle driving before any launches or track work. Owners who want a stiffer street/strip setup can compare the Clutch Masters FX250 SS Series twin with aluminum flywheel, and lighter builds may be served by the FX350 single disc.
| Brand | SPEC |
| Part number | SB55SST-8.5 |
| Fits | Spec 15-19 BMW M2/13-19 BMW M3 S55/M4 SS-Trim Twin Disc Clutch Kit |
| Vehicle fitment | BMW M2/13-19 Bmw M3 S55/M4 (2015-2019) |
| Type | Clutch Kits - Multi |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. It is for six-speed manual cars only. The seven-speed DCT has its own internal clutches and needs no conventional clutch kit.
SPEC lists SB55SST at 950 ft-lb of torque capacity. SPEC builds its Super Twin line for cars in the 700-1500 ft-lb range.
SPEC files SB55SST under its Super Twin Organic Trim category, meaning the discs use organic friction material, the type normally chosen for cars that are still driven on the street.
SPEC describes the Super Twin as a bolt-in installation with no shimming or setup. Follow SPEC's assembly order and torque values exactly.
SPEC lists the M2 for 2015-2019, but BMW used more than one engine in the M2 over that time. Send us your VIN and engine code so we can confirm before it ships.
SPEC lists the assembly weight at 44 lb, so plan on a transmission jack and a helper when fitting it.
