Comp Clutch 2-604-STU Ultra Lightweight Steel Flywheel for 83-92 Mazda RX-7 N/A

Vehicle Fitment

• Mazda RX-7 (FB/FC; 1.1 L 12A, 1.3 L 13B) -- 1983-1985 FB chassis (Base, GSL-SE)
• Mazda RX-7 FC -- 1986-1991 (1.3 L 13B Non-Turbo fits all trims)

Fitment Notes

• Ultra-lightweight flywheel (STU) -- only compatible with manual transmissions.
• Not compatible with FD chassis or turbocharged FC; confirm engine code and chassis first.

Features

• Made from 4140 forged steel, one-piece construction for maximum rigidity and safety.
• Ultra-light design (~10.6 lb) reduces rotational mass--delivers quicker throttle response and revving.
• SFI 1.5 certified for safe motorsport use.
• Compatible with stock and performance clutch assemblies, including Stage 3+ kits.
• CNC-balanced and machined to OEM specs for seamless drivability.

Specifications

• Part Number: 2-604-STU
• Material: 4140 forged steel (one-piece)
• Weight: ~10.6 lb
• Certification: SFI 1.5
• Type: Ultra-light lightweight flywheel

Included Components

• 1x Competition Clutch Ultra-Light Steel Flywheel (2-604-STU)

Product Description

The Competition Clutch 2-604-STU Ultra-Light Steel Flywheel is a precision-engineered, lightweight solution crafted for 1983-1991 Mazda RX-7 models with FB or non-turbo FC chassis and 12A or NA 13B engines. Weighing in at approximately 10.6 lb--less than half the stock flywheel--this 4140 forged steel component sharply improves throttle response, acceleration, and engine rev speed, ideal for track or performance tuning situations.

Featuring SFI 1.5 certification and a one-piece design, it ensures reliability even under high-stress conditions, while remaining compatible with OEM and upgraded clutch setups. Fully CNC-balanced and built to OEM standards, this flywheel delivers enhanced driving dynamics without compromising engine or transmission longevity.