Brock’s Extra Heavy Duty Clutch Springs are the best-kept secret in Real Street, Grudge, and other high-horsepower hand-clutch applications. Designed from valve-spring quality steel, each spring is shot-peened and stress-relieved to endure the intense heat and abuse of drag-style launches—engineered for millions of trouble-free cycles with zero sag.
Perfect for heavier riders or anyone demanding maximum clamping force, these springs deliver unmatched consistency and power transfer. When installed in the proven “Real Street” configuration, they balance heavy-duty performance with controllable lever feel.
FEATURES
- Includes (3) extra heavy duty green Springs (.120″ dia. wire)
- Proven choice in Real Street, Grudge, and high-power hand-clutch racing
- Especially effective for heavier riders
- Extends clutch life and reduces slippage under load
- Made from valve-spring quality material, shot-peened and stress-relieved
- Built to last millions of cycles without sagging
- Reference: 130 lb. static pressure at 1.04″ installed height
- Click here to view Installation Instructions
FITMENT – IMPORTANT INFORMATION BEFORE ORDERING
- Brock’s Performance ZX-14R Clutch Mod Kit or Deluxe Kit are required.
- For those who do not already have the ZX-14R Clutch Mod Kit, the full kit with the 'Real Street' configuration can be purchased here.
REAL STREET CLASS CONFIGURATION
- (67 lb. × 3) + (130 lb. × 3) = 591 lb. total
- Install heavy duty springs (green) in every other location (no shims or base washers used with these)
- Install .020″ base washer and .180″ shim with the remaining 3 clutch springs
