Stage 1 features an integrally molded carbon Kevlar-based,
high performance organic lining that offers smooth engagement and
excellent life. This lining has an integrally bonded steel backing for
strength under high clamp loads and temperatures. The hub is double
sprung with spring cover relieves for flexibility and heat treated
components for strength and durability. Stage 1 is suggested for OEM
replacement, daily driven or lightly modified 135/335s.
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Stage 2 features a pure Kevlar disc with steel backing. This
lining features excellent drivability like the Stage 1, but offers
slightly longer life and higher torque capacity. The hub is double
sprung with spring cover relieves for flexibility and heat treated
components for strength and durability. Best for moderately modified or
daily driven 135/335
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SPEC Stage 2+
SPEC's Stage 2+ features a multi-friction disc in a full faced
configuration with carbon semi-metallic on one side and Kevlar on the
other. The 2+ offers the drivability and engagement quality of Stage 2,
but with a 15-20% higher torque capacity. The hub is double sprung with
spring cover relieves for flexibility and heat treated components for
strength and durability. Stage 2+ is suggested for highly modified but
daily driven 135/335s that will see some track time.
- Features:
- Torque capacity: 450ft/lbs at
the crank
- Hybrid Kevlar and
Carbon-Graphite Friction material
- Compatible with SPEC SB53A-2
flywheel only
- FITMENT:
- BMW 135 2008-up
- BMW 335 2007-up
Stage 2+ Clutch:
SB533H
-2
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SPEC Stage 3
The SPEC Stage 3 clutch kit features a carbon semi-metallic
6-puck sprung hub disc that has been the leading pucked clutch in
drivability, life & torque capacity. Stage 3 is designed for street
& race cars that require an aggressive but streetable engagement
& high torque capacity. The hub is double sprung with spring cover
relieves for flexibility & heat treated for strength and durability.
Suggested for highly modified, street, autocross & track driven
135/335.
- Special Notes:
- Torque capacity: 508ft/lbs at
the crank
- Carbon semi-metallic friction
material
- Compatible with SPEC SB53A-2
flywheel only
- FITMENT:
- BMW 135 2008-up
- BMW 335 2007-up
Stage 3 Clutch:
SB533-2
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SPEC Stage 3+
Stage 3+ is the flagship stage for a high powered street or
race car that requires a manageable and friendly engagement. The SPEC
Stage 3+ features a carbon semi-metallic full faced material that offers
unparalleled life, friction coefficient and drivability characteristics
in one single package. The hub is double sprung with spring cover
relieves for flexibility and heat treated components for strength and
durability. Suggested for very highly modified, streetable autocross
& track driven 135/335s.
- Features:
- Torque capacity: 570ft/lbs at
the crank
- Carbon semi-metallic friction
material
- Compatible with SPEC SB53A-2
flywheel only
- FITMENT:
- BMW 135 2008-up
- BMW 335 2007-up
Stage 3+ Clutch:
SB533F-2
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SPEC Stage 4
The SPEC Stage 4 is a solid hub version of the Stage 3. The
hub is solid 8-rivet and the assembly is heat treated for strength and
durability. It is available in 6-puck for the smooth engagement. The
Stage 4 is street drivable but not street friendly due to the rigid hub.
Best for dedicated drag racing, road racing, rally or drift cars. Not
suggested for any street driven 135/335.
- Features:
- Torque capacity: 508ft/lbs at
the crank
- Carbon-Graphite Friction
Material
- Compatible with SPEC SB53A-2
flywheel only
- FITMENT:
- BMW 135 2008-up
- BMW 335 2007-up
Stage 4 Clutch:
SB534-2
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SPEC Stage 5
SPEC's Stage 5 features a full-metallic disc with the highest
possible friction coefficient. Not suggested for any 135/335 that gets
used on the street. The SPEC Stage 5 has a solid 12-rivet hub and the
assembly is heat treated for strength and durability. Best for extreme
street and drag racing. Not for street use. Very harsh engagement and
lots of noise/chatter.
- Features:
- Torque capacity: 670ft/lbs at
the crank
- Full-metallic friction
material
- Compatible with SPEC SB53A-2
flywheel only
- FITMENT:
- BMW 135 2008-up
- BMW 335 2007-up
Stage 5 Clutch:
SB535-2