Peak Drum 160mm 4×3/8in 4in PCD

The easiest way calculate the PCD is as follows:

1. Identify the size of rim or tyre size. (This helps to narrow down the likely PCD sizes)
2. Measure the distance 'S' between two adjacent studs from the centre of each hole.
3. Using the calculator enter the number of studs/holes & 'S' and press 'calculate'.
4. Using the relevant diagram depending on the number of studs you have you should be able to identify the correct PCD.

Note: Imperial sizes are commonly used on UK trailers whereas European trailers use metric.

PCD Calculator

Select Number of Studs/Holes

Please Select 3 4 5 6

Enter measurement 'S' in millimetres

Pitch Circle Diameter (PCD) =

mm

 

Common Trailer & Caravan PCD Wheel Dimensions

PCD Calculation Formula

4 Stud PCD =	S
	0.7071
5 Stud PCD =	S
	0.5878
6 Stud PCD =	S
	0.5