GFB's lightweight non-underdrive crank pulley (part number 2012) is made from anodized aircraft-grade billet 6061-T6 aluminium and offers sharper throttle response and faster acceleration.
GFB pulleys are designed to improve acceleration by reducing the rotational mass (inertia) on the crankshaft. This pulleys begins life as a single 6061 T6 aluminium alloy billet, and is then precision CNC machined to exacting tolerances. Then GFB anodizes it black for a stealthy appearance and superior wear resistance. The effect is similar to a lighter flywheel, and the engine feels more lively and willing to rev.
While some engine types do suffer harmonic issues from lightweight pulleys, GFB's products are thoroughly application tested and do NOT cause engine damage in the short or long term. GFB is accredited to ISO 9001, which ensures its products meet stringent quality requirements at all stages of manufacture.