SPEC clutches and flywheels are manufactured and developed for specific driving environments and recommended based on application. Featuring Clutch Kits From street kit Stage 1,2,2+, 3, and 3+ to Race Kits Stage 4 and 5. And now the SPEC Super Twin with TQ ratings of over 1500 FT TQ ! Every SPEC Clutch Kit and Flywheel has been SFI Approved.
SPEC billet flywheels are manufactured and developed for specific driving environments and recommended based on application.
IMPORTANT NOTE: Items on this page are for definition purposes only. These descriptions are to help explain the differences in the Stages available. Please note that your specific application may vary. Not all kits come with bearings and may or may not come with a sprung hub.
SPEC products feature Clutch Kits From street kit Stage 1,2,2+, 3, and 3+ to Race Kits Stage 4 and 5 as follows:
Stage 1:
Street, Drag, Drift, Road Race, Rally, Pulling, Autocross
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. Best for street and many track/off-road applications.
- High clamp pressure plate
- Steel-backed and multi-compound woven organic material
- High torque sprung hub and disc assembly
- Bearing and tool kit
Stage 2:
Street, Drag, Pulling, Autocross
Features segmented or full faced 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 street, drag, pulling and autocross.
- High clamp pressure plate
- Pure Kevlar friction material
- High torque sprung hub and disc assembly
- Bearing and tool kit
Stage 2+:
Street, Drag, Pulling, Autocross
Features a multi-friction disc in a full faced configuration with carbon semi-metallic on one side and Kevlar on the other. Bridging the gap between stage 2 and stage 3, the 2+ offers drivability and engagement quality characteristic of the 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. Great for street, drag, autocross, road racing, pulling, rally and drift.
- High clamp pressure plate
- Hybrid Kevlar and Carbon-Graphite Friction material
- High torque sprung hub and disc assembly
- Bearing and tool kit
Stage 3:
Street, Drag, Pulling, Autocross
Features a carbon semi-metallic 6 puck sprung hub disc that has been the leading puck clutch in drivability, life and torque capacity. This unit is designed for street and race cars that require an aggressive but streetable engagement and high torque capacity. The hub is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Also available in 3 puck configuration. Great for street, drag, road racing, pulling, rally and drift.
- High clamp pressure plate
- Carbon-Graphite Friction Material
- High torque sprung hub and disc assembly
- Bearing and tool kit
Stage 3+:
Street, Drag, Pulling, Autocross
The flagship stage for a high powered street or race car that requires a manageable and friendly engagement, the stage 3+ features a carbon semi-metallic full faced material that offers unparalleled life, friction co-efficient 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. Great for street, drag, drift, autocross, road racing, pulling, ralley and drift.
- High clamp pressure plate
- Carbon semi-metallic friction material
- High torque sprung hub and disc assembly
- Bearing and tool kit
Stage 4:
Street, Drag, Pulling, Autocross
This unit 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 a 3, 4 or 6 puck configuration. Use the 3 puck for the lightest option or the 6 puck for the smoothest engagement. The 4 puck is a good compromise for both. Street drivable in 6 puck configuration, but not street friendly due to the rigid hub. Best for drag racing, road racing, pulling, rally and drift.
- High clamp pressure plate
- Carbon-Graphite Friction Material
- High torque solid hub and disc assembly
- Bearing and tool kit
Stage 5:
Street, Drag, Pulling, Autocross
Features a full-metallic disc with the highest possible friction co-efficient. Street drivable but not street-friendly. The hub is solid 12-rivet and the assembly is heat treated for strength and durability. Best for extreme street and drag racing.
- High clamp pressure plate
- Full-metallic friction material
- High torque solid hub and disc assembly
- Bearing and tool kit
LIMITED WARRANTY: S.P.E.C., Inc warrants all products to be free of defects in materials and workmanship for normal use and service up to 120 days after retail purchase. SPEC reserves the right to examine any part returned for warranty claim to determine whether a defect in materials or workmanship exists in such product. SPEC liability is limited to repairing, replacing or crediting towards other product, and credits will not exceed the invoice total for the parts. Labor and storage charges are not products of SPEC and, therefore, will not be reimbursed for any reason. Final determination of the condition and suitability of the parts for uses contemplated by the buyer is a sole responsibility of the buyer. SPEC will not be liable for any damage or injury to persons or property that might be claimed as a result of improper installation or misuse of any part subject to this warranty. Return shipping to SPEC will not be pre-paid or paid for. Customer is responsible for return shipping for inspection. There are no warranties expressed or implied beyond those set forth above.
INSTALL NOTES: Unless using a new flywheel provided by SPEC, existing unit must be resurfaced prior to installation of the clutch product to ensure integrity of friction surface. Owner must also break in the new high performance clutch for a minimum of 450 miles, primarily city and/or stop-and-go driving, before full throttle engagement, drag launching or speed shifting. * FAILURE TO EXECUTE EACH OF THE ABOVE WILL HINDER CLUTCH PERFORMANCE AND VOID ALL WARRANTY!!! Unless otherwise instructed by written notice from SPEC, follow manufacturer’s instructions when installing clutch and flywheel products. SPEC recommends that all bolts be inspected before re-installation, and any bolts that have been removed and re-torqued multiple times replaced. SPEC will not warrant any component failure due to install error.