Identify the size of rim or tyre size, this helps to narrow down the likely PCD sizes.
To calculate the PCD for your 3 or 5 stud wheel you can use the following
set of calculations.
3 stud length ‘A’ x 1.154 = PCD
5 stud length ‘A’ x 1.7012 = PCD

Common Stud Patterns:

4 STUD 4” PCD                          5 STUD 112mm PCD
4 STUD 100mm PCD                5 STUD 140mm PCD
4 STUD 115mm PCD                5 STUD 6.5” PCD       
4 STUD 5.5” PCD                                     

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