Find a wheel PCD from the adjacent-stud distance, and convert mm to inch.
4, 5, 6 or 8-stud wheels each use a different geometry formula.
Measure centre-to-centre between two neighbouring studs in mm.
We compute the pitch circle diameter, e.g. 5x112 or 5x114.3.
5 studs on a 112 mm pitch circle diameter (PCD). The first number is the lug count, the second is the diameter of the circle the studs sit on.
Measure the distance between the centres of two adjacent studs, then the calculator divides by sin(36 deg) to get the PCD. For 4 and 6-lug you can also measure straight across opposite studs.
No. Even a 2 mm PCD difference will not bolt up safely; you need the exact pattern or proper PCD-changing adapters.
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