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What is my Wheel P.C.D.

by | Oct 17, 2019 | Electric Brakes | 0 comments

What is a PCD measurement, and how do I calculate it?

“What is a wheel PCD? How do I calculate it?” is a frequent question from customers.

So, What is a Wheel PCD? The two main components for deciding on the installation of new wheels are:

  1. PCD is the diameter of the total number of studs
  2. and wheel or rim offset.

Due to the wide variety of rims and tyres.

The video below quickly identifies how to calculate wheel or rim offset.

Several factors decide the correct length of the axle; they are

  • wheel width
  • wheel size
  • positive offset or negative offset
  • type of wheel and tyre
  • mounting surface
  • vehicle wheels and rim type

Technically, Pitch Circle Diameter (P.C.D.) is the circle diameter that passes through the centre of the wheel studs, wheel bolt holes, wheel rim holes or the bolt pattern.

This information is handy for selecting the correct alloy wheel rim.

Vehicle manufacturers have difficulty providing a wheel offset size because car buyers often change the tyre size.

P.C.D. or wheel stud pattern is needed when you wish to replace a worn axle, hub, drums or disc rotors.

It is impossible to provide the correct hub or electric drum without knowing the exact wheel stud pattern.

Couplemate recommends installing wheel nut indicators to help prevents loosening wheel nuts.

Wheel PCD Measurement Calculation Formula

  • 4 Stud PCD = Stud distance divided by 0.7071 to get PCD
  • 5 Stud PCD = Stud distance divided by 0.5878 to get PCD
  • 6 Stud PCD = Stud distance divided by 0.5 to get PCD

For example, 67.185mm / 0.5878 for a five stud with 1/2″ studs is 114.3mm, a Ford Stud Pattern.

Finally, download a list of PCDs from Al-ko by clicking this link.

News article on wheel nut indicators.

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