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GrimmSpeed 15+ Subaru BRZ/FR-S Lightweight Crank Pulley - Blue


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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.

Quick Specs

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

This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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