STM Italy Evoluzione 121mm Diaphragm Primary Spring 100kg - OS1121/100 For Sale - New and Used

Precision Engineering: Unlike standard coil springs, this diaphragm spring provides a more consistent and linear force across the entire clutch face, significantly reducing plate wear and lever effort. NR1 Motor

• Race-Proven Performance: The 100kg spring rate is specifically calibrated for riders seeking a balanced clutch feel that prevents rear-wheel hop during aggressive engine braking.

• Evoluzione Technology: Designed as a direct replacement part for STM Evoluzione slipper clutch kits, ensuring perfect fitment and maintaining the "slipper" functionality that protects your engine and gearbox. Omnia Racing

• High-Quality Materials: Constructed from high-grade spring steel to resist heat fatigue and maintain its tension rating even under the extreme temperatures of track use.

• Compatibility: This 121mm spring is widely used in STM dry clutch conversions for Ducati and other European sportbikes. MCET

Part Number: OS1121/100

Type: Primary Diaphragm Spring

Diameter: 121mm

Spring Rate: 100kg

Origin: Made in Italy

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