If you're thinking about changing your wheels, buying new ones, or just confirming compatibility with your car, there's an essential technical detail you need to know: the PCD . In this article, we explain in simple terms what PCD is, why it's important, and how you can measure it correctly .
What is PCD?
PCD stands for Pitch Circle Diameter and corresponds to the diameter of the imaginary circle that passes through the center of the bolt holes on the rim .
It is typically presented in the following format:
Number of holes x diameter
Example: 5x112 (5 holes arranged in a 112 mm circle)
This value must be exactly the same as the vehicle's hub. Even minimal differences make the wheel incompatible.
Why is it important to measure PCD correctly?
An incorrect PCD (Post-Graphic Disability) can cause:
- Difficulty or impossibility of assembly
- Vibrations in progress
- Premature wear of screws and hubs.
- Safety issues and inspection failures
Therefore, accurately measuring the PCD (Proximity to Wheelbase) is essential before purchasing wheels or related accessories.
How to measure the PCD of wheel rims
Wheels with 4 holes
This is the simplest case.
- Measure the distance from the center of one hole to the center of the opposite hole.
- The value obtained is directly the PCD.
Example:
- Measurement: 100 mm → PCD 4x100
Wheels with 5 holes
This is the most common type, and also the one that generates the most questions.
Most commonly used method
- Measure the distance from the center of one hole to the outer edge of the furthest hole.
- The value obtained corresponds to the PCD.
Alternative method (comparison)
Measure the distance between two adjacent holes and compare it to typical values:
- ~58 mm → 5x98
- ~64 mm → 5x100
- ~66 mm → 5x108
- ~70 mm → 5x112
- ~74 mm → 5x120
This method is useful for confirmation when there is no information from the manufacturer.
Wheels with 6 holes
- Measure the distance from the center of one hole to the center of the opposite hole.
- This measure corresponds to the PCD (People with Disabilities).
Example:
- Size: 139.7 mm → PCD 6x139.7
Recommended tools
For greater accuracy, use:
- Caliper
- Rigid metal ruler
- Specific PCD meter (professional use)
Avoid measuring by eye or using flexible instruments.
Beware of false compatibilities.
Visually similar people with disabilities are not compatible .
- 5 x 98 ≠ 5 x 100
- 5 x 110 ≠ 5 x 112
Using wheels with incorrect PCD markings is only possible with specific adapters , which is not always advisable.
Conclusion
Knowing how to measure the PCD (People with Disabilities) is essential to ensure safety, compatibility, and comfort while driving. Before buying wheels, bolts, or accessories, always confirm this value.
At chaveauto.pt you will find a wide range of automotive accessories and components compatible with different bolt patterns. If in doubt, always confirm your vehicle's specifications.
Final tip: If you are unsure about the PCD (People with Disabilities) option, consult the vehicle's manual or contact a specialist before making the purchase.