Measuring a PCD
If you are looking to change your wheel assembly or wheel rim you will need to know the Pitch Circle Diameter (PCD) of the wheel hub on your trailer – and if you don’t already know what your trailer’s PCD is, it will have to be measured. But no need to worry, we are here to help you do that!
Read on through our trailer PCD measuring guide to discover what a PCD is and how you can measure it yourself.
If you have any questions or want any further advice on PCD measurements or any other trailer-related inquiry get in touch with one of our highly experienced, friendly team members.
ALREADY KNOW YOUR PCD MEASURMENT?
Great! Take a look at our trailer wheel assemblies and wheel rims.
WHAT IS A WHEEL PCD?
On any trailer wheel assembly or rim, the PCD is the diameter of the circle which passes through the centre of all the wheel bolts or wheel rim holes. The center of every bolt hole lies along the edge of the pitch circle and are evenly spaced. The pitch circle diameter is typically expressed in mm and is given along with the number of bolts/bolt holes. One example is 5x100; this means there are 5 bolts evenly spaced about a 100mm bolt circle.
an example of a 5x100 bolt pattern. The wheel has 5 lug nuts and utilizes a 100mm pitch circle diameter.
MEASURING A PCD
The easiest fitment to measure is one with 4 lug nuts, you can measure from the center of one stud to the center of the stud directly opposite. However, for 5 stud and 6 stud PCD's you can use a simple method:
Measure the distance between two adjacent studs from the centre of each hole. and then use these simple formulae:
5 Stud PCD = S / 0.5878
6 Stud PCD = S / 0.5