Flywheel UItra Light Nissian RB20/RB25

The Flywheel Ultra Light Nissan RB20/RB25 by UNICLUTCH is engineered for enthusiasts and performance builders seeking to reduce rotational inertia and unlock faster throttle response on RB-series powerplants. This ultra-light design is essential for forced-induction builds, drift applications, and high-RPM track engines where engine revving speed directly translates to power delivery consistency and acceleration feel. Whether you're tuning a street-driven RB25DET or prepping a circuit-focused RB20, a lightweight flywheel eliminates parasitic drag that stock cast-iron units impose on the crankshaft.

At just 11 lbs, the Flywheel Ultra Light Nissan RB20/RB25 shaves significant mass compared to factory flywheels, which typically weigh 16–20 lbs depending on transmission pairing. UNICLUTCH's precision manufacturing maintains perfect concentricity and balance while using optimized hub geometry to ensure proper engagement with OEM and aftermarket clutch systems. The reduced moment of inertia shortens spool-up times on turbocharged applications and enables quicker gear transitions, making the engine feel more responsive without sacrificing reliability or drivability on street cars.

This flywheel fits both RB20 and RB25 configurations, making it ideal for engine swaps, stock-car upgrades, and hybrid platform builds common in the Nissan tuning community. Installation requires removal of the transmission and clutch assembly, a task best handled by shops familiar with RB-series engine work or experienced DIY builders with proper tooling. The Flywheel Ultra Light Nissan RB20/RB25 pairs seamlessly with stock clutches on lower-boost applications, though pairing it with a high-performance or adjustable clutch optimizes the benefits for forced-induction platforms pushing serious boost levels.