Hub and Spoke Sizes
The tables on this page will enable you to establish your wheel hub and spoke sizes.
Some spokes are butted so that the hub end of the spoke has a larger diameter than the rest of the spoke.
Always mention it if your spokes are butted but describe them using
the smaller diameter. The end of the spoke is threaded using rolls
which make the finished thread of larger diameter than that of the
spoke. The thread is of B.A. form and has 32 threads per inch.
| Wire Gauge -
diameter of spokes |
Imperial Wire Gauge
|
America Wire Gauge
|
Diameter in inches
|
Diameter in
millimetres
|
|
2
|
0.258
|
6.527
|
|
3
|
|
0.252
|
6.400
|
|
4
|
|
0.232
|
5.894
|
|
3
|
0.229
|
5.816
|
|
5
|
|
0.212
|
5.384
|
|
4
|
0.204
|
5.181
|
|
6
|
|
0.192
|
4.876
|
|
5
|
0.182
|
4.622
|
|
7
|
|
0.176
|
4.470
|
|
6
|
0.162
|
4.114
|
|
8
|
|
0.160
|
4.064
|
Wheel Hubs
In Europe most hubs are of the Rudge-Whitworth type with V-shaped standard splines having dimensions as below. In America, and also on Rolls-Royce cars, you may find RAF type hubs which have square splines.
Actual hub diameter is taken across the outside of the splines on the car, not from the wheel hub which is shown here in cross section.
The wheel type designation refers to the maximum size of the outer bearing in millimetres which can be used with that hub.
| Wheel Hubs - dimensions
in millimetres |
Wheel type
|
Actual hub diameter
|
Number of splines
|
Spline length
Short hub
|
Spline length
Long hub |
|
35
|
52.0
|
62
|
36
|
56
|
|
42
|
62.5
|
75
|
37
|
62
|
|
52
|
73.0
|
88
|
37
|
62
|
|
62
|
82.5
|
100
|
57
|
78
|
|
72
|
92.0
|
112
|
55
|
84
|
|
80
|
102.0
|
124
|
58
|
87
|
|
90
|
111.5
|
136
|
56
|
94
|
|
100
|
123.0
|
150
|
59
|
97
|
|
120
|
137.0
|
168
|
63
|
101
|
|
