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7 mm/ft
GWR 4-6-0 Star driving wheels.

6′ 8½″ diam., 22 oval spokes, rectangular inner rim, 4¼″ apparent tread.
Hub 17″ face dia., 3″ out from the tyre, pin in line at 13″.

Sources: O.S. Nock, British Locomotives of the 20 th Century, vol. 1, page155. Reduced works drg. of Star class.

Casting: 47.0 mm tread dia., 41.8 mm i/d., hub 1.75 mm out from the tyre, pin at 7.6 mm.

Casting prices and stock . GWR loco sets, price list

Scan of the castings in sets for a GWR 4-6-2 Great Bear, 4-6-0 Star, 4-4-2 North Star.

Scan of castings B185

Cross section diagram of castings B185
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