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 calculator enter the number of studs/holes & 'S' and press 'calculate'.
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
Common Trailer & Caravan PCD Wheel Dimensions
Rim Size
Studs
8" Rim
3
76.90mm
88.8mm
3
95.26mm
110mm
4
70.71mm
100mm
4
71.84mm
101.6mm (4")
4
81.32mm
115mm
4
91.92mm
130mm
10" Rim
4
70.71mm
100mm
4
71.84mm
101.6mm (4")
4
79.20mm
112mm
5
65.83mm
112mm
4
81.32mm
115mm
4
91.92mm
130mm
4
98.78mm
139.7mm (5½")
12" Rim
4
70.71mm
100mm
4
71.84mm
101.6mm (4")
5
65.83mm
112mm
4
91.92mm
130mm
4
98.78mm
139.7mm (5½")
5
82.29mm
140mm
5
97.04mm
165.1mm (6½")
13" Rim
4
70.71mm
100mm
4
79.20mm
112mm
5
65.83mm
112mm
4
91.92mm
130mm
4
98.78mm
139.7mm (5½")
5
82.29mm
140mm
5
97.04mm
165.1mm (6½")
14" Rim
4
70.71mm
100mm
5
65.83mm
112mm
5
82.29mm
140mm
5
89.58mm
152.4mm (6")
6
102.5mm
205mm
16" Rim
5
97.04mm
165.1mm (6½")
PCD Calculation Formula
4 Stud PCD =
S
0.7071
5 Stud PCD =
S
0.5878
6 Stud PCD =
S
0.5
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