What Is Wheel PCD & Why It Matters for Your Vehicle?

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 by Chesca D
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Wheel PCD, or Pitch Circle Diameter, is an essential measurement that determines how securely and accurately your wheels are fitted. In this quick guide, we explain what Wheel PCD means, how to measure it on different wheel types, and why getting it right is vital for alignment, handling, and overall vehicle safety.

If you even read through your MOT certificate or full vehicle service report, you will notice that British mechanics love to use an acronym to describe or refer to a specific component in your vehicle. 

Wheel PCD is one of them – and stands for Wheel Pitch Circle Diameter.

Still confused? Here’s a beginners guide to Wheel PCD, what it is, and why it’s important. 

What is Wheel PCD?

The Wheel PCD – Pitch Circle Diameter – is the diameter of the circle which connects each of the wheel bolts.

If you look at the wheel of your car, you will see a series of bolts which hold the silver centre of the wheel in place. Measuring between two opposite bolts will give you the Wheel PCD measurement. However, this needs to be accurate – and is only really easy to do on a wheel with four bolts, sitting two bolts opposite each other. 

Alternatively, if your vehicle has more than four bolts and is thus more difficult to measure accurately, you can follow the below process:

  1. Measure the distance between the centre of one bolt, and the centre of the bolt directly next to it
  2. If there are 5 bolts, divide this measurement by 0.587

If there are 6 bolts, divide this measurement by 0.5

This will give you an accurate reading of the Wheel PCD. 

NOTE: The more bolts the wheel uses to hold it firmly in place, the larger the PCD measurement will be.

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Why is Wheel PCD Important?

Wheel PCD is an important part of wheel alignment, as it ensures that the wheel is straight for optimum driving comfort, efficiency, and safety.

For those seeking new tyres or looking to have replacement wheels fitted to their vehicle, knowing the Wheel PCD is an important step in sourcing the right materials and products to complete the job effectively. Here at Tyres.co.uk, we can talk you through the measurement of your vehicle’s Wheel PCD and can help you to identify the best replacement tyres to make driving both safe and enjoyable again!

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