![Go Fast Bits Subaru BRZ/86/FR - S Lightweight Alternator Pulley - Go Fast Bits](http://jdcustomsusa.com/cdn/shop/products/go-fast-bits-subaru-brz86fr-s-lightweight-alternator-pulley-328482.jpg?v=1738947244&width=1600)
Go Fast Bits Subaru BRZ/86/FR-S Lightweight Alternator Pulley
SKU:GFB2221
![Go Fast Bits Subaru BRZ/86/FR - S Lightweight Alternator Pulley - Go Fast Bits](http://jdcustomsusa.com/cdn/shop/products/go-fast-bits-subaru-brz86fr-s-lightweight-alternator-pulley-328482.jpg?v=1738947244&width=1600)
Go Fast Bits Subaru BRZ/86/FR-S Lightweight Alternator Pulley
Like all GFB lightweight pulleys, these begin life as a single 6061-T6 aluminium alloy billet, which is then precision CNC machined to exacting tolerances. We then anodize them black for a stealthy appearance and superior wear resistance.
This kit is supplied with 3 pulleys, not just for looks – the combined saving of 2.2 kg is significantly more than what is achieved by replacing just the crank pulley alone.
The weight doesn’t tell the whole story either – even though the saving is a significant 77%, the actual rotating inertia reduction (inertia is what counts) is 83%.
Like all GFB lightweight pulley kits, you can feel the improvements:
- Sharper throttle response
- Engine feels more willing to rev
- Stronger “urge”
Fitments:
- TOYOTA 86 (ZN6) GT-GTS 12-On
- SUBARU BRZ MY12-On
![](http://jdcustomsusa.com/cdn/shop/files/Black-sticker_web.webp?v=1737647612&width=800)