The Pitch Circle Diameter (PCD) is the diameter of the circle which passes through the centre of all the studs, wheel bolts or wheel rim holes.
The easiest way calculate the PCD is as follows:
- Identify the size of rim or tyre size. (This helps to narrow down the likely PCD sizes)
- Measure the distance 'S' between two adjacent studs from the centre of each hole.
- Using the relevant formula below (depending on how many studs/holes you have) enter the measurement of 'S' and calculate the PCD
- Depending on how accurately the measurement of 'S' has been the PCD should equal one included in the table below. This table should also be able to help identify the correct PCD if 'S' in a few milimeters out.
Note:
Imperial sizes are commonly used on UK trailers whereas European trailers use metric.
4 Studs/Holes
5 Studs/Holes
6 Studs/Holes
PCD Calculation Formula
4 Stud PCD = |
S |
0.7071 |
|
|
5 Stud PCD = |
S |
0.5878 |
|
|
6 Stud PCD = |
S |
0.5 |
Popular wheel Sizes & Stud Patterns
Rim Size |
Studs |
S |
PCD |
8" |
3 |
76.90mm |
88.8mm |
8" |
3 |
95.26mm |
110mm |
8" |
4 |
70.71mm |
100mm |
8" |
4 |
71.84mm |
101.6mm (4") |
8" |
4 |
81.32mm |
115mm |
8" |
4 |
91.92mm |
130mm |
10" |
4 |
70.71mm |
100mm |
10" |
4 |
71.84mm |
101.6mm (4") |
10" |
4 |
79.20mm |
112mm |
10" |
5 |
65.83mm |
112mm |
10" |
4 |
81.32mm |
115mm |
10" |
4 |
91.92mm |
130mm |
10" |
4 |
98.78mm |
139.7mm (5½") |
12" |
4 |
70.71mm |
100mm |
12" |
4 |
71.84mm |
101.6mm (4") |
12" |
5 |
65.83mm |
112mm |
12" |
4 |
91.92mm |
130mm |
12" |
4 |
98.78mm |
139.7mm (5½") |
12" |
5 |
82.29mm |
140mm |
12" |
5 |
97.04mm |
165.1mm (6½") |
13" |
4 |
70.71mm |
100mm |
13" |
4 |
79.20mm |
112mm |
13" |
5 |
65.83mm |
112mm |
13" |
4 |
91.92mm |
130mm |
13" |
4 |
98.78mm |
139.7mm (5½") |
13" |
5 |
82.29mm |
140mm |
13" |
5 |
97.04mm |
165.1mm (6½") |
14" |
4 |
70.71mm |
100mm |
14" |
5 |
65.83mm |
112mm |
14" |
5 |
82.29mm |
140mm |
14" |
5 |
89.58mm |
152.4mm (6") |
14" |
6 |
102.5mm |
205mm |
16" |
5 |
97.04mm |
165.1mm (6½") |
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