Your factory crank pulley is responsible for transferring energy from your crankshaft to your water pump, a/c compressor and alternator. It does this by way of a rubber belt and it does it’s job well. The drawback to the factory pulley is that it’s quite heavy. Reasons for this include less expensive manufacturing and using the pulley’s mass to smooth out ‘noise’ in the accessory system (NOT to be confused with functioning as a harmonic dampener, which it does not). The GrimmSpeed Lightweight Crank Pulley reduces the rotational mass of the system, allowing your engine to accelerate and decelerate the rotating assembly more quickly.
75% Reduction in Rotating Mass – weighs 1.1lb vs the 4.4lb OEM pulley
Machined 6061 T6 Aluminum – high quality, precision construction
Hard Anodized Finish – ensures a durable finish and resists corrosion
Removal Tool Mounting – allows the use of the GrimmSpeed Crank Pulley Tool
Factory Fitment – direct replacement for easy installation
Like any GrimmSpeed product, these pulleys are built to last. Using locally sourced 6061 T6 aluminum billet, the pulleys are machined and measured to verify critical dimensions before being anodized. The bright dip anodizing process that we use ensures a durable finish that will protect the pulley from corrosion. Lastly, each pulley is laser etched with a sharp GrimmSpeed logo.
2013+ Subaru BRZ
2015+ Subaru WRX
2013+ Scion FR-S