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7 mm/ft scale
SR 4-6-2 Bullied Pacific bogie wheels.

3′ 1″ diam., boxpok welded from plate, 3½″ apparent tread. Hub 12¼″ face dia, level with the tyre.

Source: Winston Churchill measured direct at York in August 1995.

Casting: 21.6 mm tread diam., 17.7 i/d., hub level with the tyre.

Casting prices and stock . SR loco sets, price list

Scans of a casting in a set for SR 4-6-2 Bullied Pacifics

Scan of casting B80

Cross section diagram of casting B80
This example shows a tyre width of 3.5 mm for Gauge 0 Fine.
For Scale7 remove more metal from the back of the wheel to give a tyre thickness of 3.2 mm instead of 3.5 mm.

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27 Mar 2013