Collection: Lightweight Pulley Kits

GFB lightweight pulley kits are precision-engineered from aircraft-grade 6061-T6 aluminum, delivering faster acceleration by significantly reducing crankshaft weight.

Many of our kits feature an underdriven design, meaning accessories are driven slightly slower to minimize parasitic losses. By reducing rotational mass (inertia) on the crankshaft and decreasing accessory loads, GFB pulley kits enhance acceleration, making the engine feel more responsive and eager to rev—similar to the effect of a lighter flywheel.

We understand concerns about potential drawbacks of lightweight pulleys and underdriving, but rest assured, we’ve done extensive research and testing. Our optimized underdrive ratios ensure no negative impact on accessory performance. Additionally, we avoid engine types prone to harmonic issues, ensuring all our kits are thoroughly application-tested and safe for both short- and long-term use.