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Wheel hub dimensions (mm)

Wheel Type Note 1.	Actual Hub Diameter Note 2.	Number of Splines	Spline Length Short Hub	Spline Length Long Hub
35	52	62	36	56
42	62.5	75	37	62
52	73	88	37	62
62	82.5	100	57	78
72	92	112	55	84
80	102	124	58	87
90	111.5	136	56	94
100	123	150	59	97
120	137	168	63	101
Note 1. The wheel type designation refers to the maximum size of outer bearing, in millimetres,  which can be used with that hub.
Note 2. Actual hub diameter is measured across the outside of the splines on the car and not the wheel itself.

Rolls Royce RAF spline wheel centre

Rudge fine spline 52mm

In Europe most hubs are of the Rudge-Whitworth type with V-shaped splines with dimensions as above.

On Rolls-Royces, and in America, you may find RAF type hubs which have square splines.
Wheel Centres