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PCD (Pitch Circle Diameter) explained

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RB5 286
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Join date : 2010-01-28
Location : Essex

PCD (Pitch Circle Diameter) explained

Post  RB5 286 on Thu Jan 28, 2010 6:02 am

The PCD (Pitch Circle Diameter) is the diameter of the circle pattern of the bolts that hold your wheel on. STI's have since the 2005 Blob been PCD 114, with previous STi's and all other scoobies being 100mm. Allegedly the PCD in STi was increased to cope with the cornering loads imposed by the introduction of the Potenza RE070 tyre, with its semi slick cut tread as the larger PCD is a function of the larger hubs engineered to take the larger load.

So why is it relevant. If your PCD is 100mm, then STi sized brakes will not fit on your hubs unless they are dual pattern. Similarly when you buy wheels you will need to chose wheels of that pattern as well. I have an 07 WRX on PCD 100mm, and my STi hatch on PCD 114, so no swapping about of hand me downs from the STi to the WRX as upgrade mania sets in.
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MOTORS S-GT

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Re: PCD (Pitch Circle Diameter) explained

Post  MOTORS S-GT on Fri Jan 29, 2010 9:55 am

The non STI Hatches are 100 pcd, so if like me you updated your WRX, S-GT, or Diesel varient,to full STI Brembo setup redrilling of the front STI discs is required, the rears or certainly the ones i fitted were dual drilled.
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Celtic Dragon

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Re: PCD (Pitch Circle Diameter) explained

Post  Celtic Dragon on Fri Jan 29, 2010 10:10 am

That confrims what I though. Cheers MSGT. This week is not turning out to be a good week car wise.

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