Specialised
Automobile Services
Britain's Leading Wire Wheel Specialists |
Worn Hub Diameters |
| Over the years the threads of the lock
nut and hub wear, particularly if the wheel is run loose and the serrations of the hub and
wheel shell fret, ultimately becoming dangerous. The table
below gives details for Rudge-Whitworth wheels from No.5 introduced in 1908 to the more
well known types 42 to 120 which were introduced in 1912. The earlier ones were used with
wooden spoked wheels as seen in the hub cross section opposite |
|
| If the lock nut is worn enough to admit
a plug of the diameter in column A it should be replaced. If the hub thread is worn enough
to enter a ring of the diameter given in column B, the hub should be chased down to the
diameter given in column D and fitted with a specially made lock nut to the diameter given
in column C. If the hub serrations are worn smaller than
the diameter in column E, the hub should be replaced. If the wheel serrations are worn to
a larger diameter than the diameter in column F, the wheel centre should be replaced. All
dimensions are in inches. |
| Type |
Test for worn locknut
diameter |
Test for worn hub thread diameter |
Re-fitted
lock nut
diameter |
Re-chased
hub thread
diameter |
Min hub
diameter |
Max diameter inside
wheel hub |
| |
A |
B |
C |
D |
E |
F |
| 5 |
3.690 |
3.770 |
3.751 - 3.756 |
3.740 - 3.750 |
|
|
| 6 |
2.815 |
2.895 |
2.876 - 2.881 |
2.865 - 2.875 |
|
|
| 8 |
1.825 |
1.905 |
1.886 - 1.891 |
1.875 - 1.885 |
3.225 |
3.175 |
| 9 |
2.815 |
2.895 |
2.876 - 2.881 |
2.865 - 2.875 |
4.626 |
4.576 |
| 42 |
2.211 |
2.291 |
2.296 - 2.301 |
2.292 - 2.295 |
2.424 |
2.374 |
| 52 |
2.627 |
2.707 |
2.702 - 2.707 |
2.698 - 2.701 |
2.840 |
2.790 |
| 62 |
3.011 |
3.091 |
3.076 - 3.081 |
3.072 - 3.075 |
3.224 |
3.174 |
| 72 |
3.377 |
3.457 |
3.442 - 3.447 |
3.438 - 3.441 |
3.590 |
3.540 |
| 80 |
3.760 |
3.840 |
3.825 - 3.830 |
3.821 - 3.824 |
3.973 |
3.923 |
| 90 |
4.141 |
4.221 |
4.206 - 4.211 |
4.202 - 4.205 |
4.354 |
4.304 |
| 100 |
4.587 |
4.667 |
4.652 - 4.657 |
4.648 - 4.651 |
4.800 |
4.750 |
| 120 |
5.160 |
5.240 |
5.225 - 5.230 |
5.221 - 5.224 |
5.373 |
5.323 |
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