Lightweight Crank Pulley - Subaru

GS Pulley Removal/Install Tool
Gates 93-07 OEM A/C Belt
Gates 08+ A/C Stretch Belt
GS/Gates Stretch Kit Adaptor
Gates Stretch Fit Install Tool Kit
( 7 Reviews )

Current stock: 0

Improve Engine Response and Faster Rev's

GrimmSpeed Subaru Lightweight Crank Pulley
  • Fits all Imprezas 93-11, Legacy 1994-2009, Forester 1998-2009
    • Decreases rotational mass more than 3.5lbs over OEM (You will see much faster revs as a result)

    • Factory Fit for clean install

    • Optimum weight to avoid misfire CELs or hesitation

    • 2008+ OEM Subaru Stretch Belt Install Kit Option
      (No other company offers this Optional Add-On)

    • Balanced CNC machined 6061 T6 anodized Aluminum 
  • Includes OEM timing marks for timing verification.


In our opinion, the OEM Subaru crank pulley has been a cause for concern ever since its original design. It is relatively heavy, susceptible to catastrophic failure, and quite unsightly. Continuing to use this on our cars just wouldn't do. Eliminating rotational mass while maintaining a safe presence can increase reliability and bring faster Rev's! For our Lightweight Crank Pulley we pulled out all of the stops. CNC machined from 6061 T6 Aluminum our pulley makes no compromise. It weighs in at 3.5lbs lighter than OEM while at the same time increasing its durability. Marked with a timing mark and perfect cut keyway makes this install a breeze. We designed the pulley with the optimum weight for performance while avoiding misfire CEL's and engine hesitation.

Here at GrimmSpeed innovation is the standard with every product we release and our pulley is no exception. We have designed the only aftermarket pulley installation and removal tool that works with each style of OEM Subaru pulley as well as our aftermarket lightweight pulley. To take it one step further we have also designed the only compatible aftermarket stretch belt installation kit for all 2008+ Subaru Models.

Achieving balance between performance and design while not sacrificing either, it's what you can expect from GrimmSpeed™

Based on our analysis, the OEM crank pulley does not act as a harmonic damper found on for example traditional V8 engine dampers. The elastomer portion of the pulley helps dampen some noise from the engine accessories (ie. alternator, PS pump, and A/C compressor) but in our experience, the increase in this noise is in-perceivable.

Options - Explanation of Parts

Gates OEM A/C Belts - This is a replacement A/C Belt for your vehicle.

Gates 08+ Impreza Stretch Belt Kit - In 2008, Subaru did away with the A/C Belt Tensioner and instead went with a stretch belt. In order to install/remove this Subaru A/C Belt you need the Stretch Belt Kit for all 2008+ Imprezas.

GrimmSpeed Pulley Removal/Install Tool - This unique tool allows you to hold the pulley in place while you are trying to loosen/tighten the center crankshaft bolt. Another great feature is that it will work with both OEM Pulleys AND the GrimmSpeed Pulley. This is truly a first of its kind tool that is great to have in your toolbox.

GrimmSpeed/Gates Stretch Kit Adapter - We have created a unique adapter that allows you to use the Gates Stretch Belt Kit for the 2008+ Impreza with the GrimmSpeed Pulley. Other manufacturers tell you to use the Gates kit on the 2008+ Imprezas but they fail to mention that the Gates Kit will not work on their pulley. We've solved this problem for our pulley.


7 Reviews

Christopher Dirkschneider 27th May 2017

Third time, for 3rd car

I've used the lightweight crank pulley again on my most recent Subaru project: 2000 2.5RS Racecar. It worked awesomely on my previous 2 Subarus; 2004 Forester STI conversion and 2013 STI Limited. Love GrimmSpeed's products and customer service, it is excellent in all regards!

Cody K 23rd Dec 2015

Should be your first purchase, after buying the car

Bought a 2016 STI and read a bunch of posts on several forums about the stock pulley failing. Got this on sale during black Friday and figured for $109 it was worth the risk, I have spent more on worse before. I did not buy the belt install tool, used a screwdriver and my hands along with a quick search on YouTube and got the belt off and on simply by turning the engine over and applying slight pressure to walk the belt off and back on the a/c compressor. After install first thing I noticed was the engine no longer bogged down when the a/c clutch cycled on. Before the engine would drop around 200-300 rpm but now doesn't drop but 50 now. Idle quality is much smoother and while it won't give you any more power, it allows the engine to turn with less effort. The engine by design does not have any harmonic imbalance (search Subaru engine design) as the cylinders are directly across from each other unlike an inline or v type. Best visual is like strumming a guitar string while moving your hand in the same motion as the connecting rod moves. So the weight reduction only helps in this case. Overall VERY happy with this purchase and would not hesitate to recommend to others!

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