Spec Clutch SR054 Stage 4 Performance Clutch Kit

The SPEC SR054 Stage 4 Clutch Kit is a high-performance racing clutch designed for heavily modified engines where maximum torque capacity, instantaneous engagement, and reduced rotating mass are the top priorities. Built entirely in the USA, this kit represents SPEC's race-grade single-disc offering, engineered for competitors who demand uncompromising grip and holding power on the track.

The Stage 4 is a solid hub evolution of the Stage 3, featuring a high-clamp pressure plate paired with a carbon semi-metallic friction disc on a solid 8-rivet hub that is heat-treated for maximum strength and durability. The rigid hub design delivers instantaneous, no-slip engagement — a critical advantage in drag, road race, rally, drift, circle track, and pulling applications. Due to the rigid hub construction, this kit is not recommended for street use.

Available Puck Configurations:

• 3-Puck: Lightest rotating mass — ideal for applications where rev response is the top priority
• 4-Puck: Balanced compromise between weight savings and engagement smoothness
• 6-Puck: Smoothest engagement of the three options; marginally street-drivable but still not street-friendly due to the rigid hub

Kit Includes:

• High-clamp performance pressure plate
• Carbon semi-metallic puck friction disc (3, 4, or 6-puck configuration)
• High-torque rigid hub and carrier assembly
• Release bearing
• Installation tool kit

Recommended Driving Applications: Drag Racing, Road Racing, Drift, Rallye, Circle Track, Pulling

SPEC clutches are designed, hand-built, and tested in the USA to precise tolerances, making the SR054 a trusted choice for serious motorsports competitors.