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7 mm/ft
BR standard bogie wheel.

3′ 0″ diam., 9 oval spokes, vee inner rim, 3½″ apparent tread, 6″ tyre width.
Hub 10¼″ face dia., spreading to 14¼″ at the base rim, 1½″ out from the tyre.

Sources: 4MT measured direct and BR Derby works drawing.

Casting: 21.0 mm tread dia., 16.8 mm i/d, hub 0.3 mm out from the tyre.

Casting prices and stock . BR loco sets, price list

Scan of a casting in a set for a BR 2-10-0 9F, 2-6-0 3MT/4MT

Scan of casting B74

Cross section diagram of casting B74
This example shows a tyre width of 3.5 mm for Gauge 0 Fine.
For Scale7, 3.5 mm is also correct for a 6″ wide tyre.

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27 Mar 2013