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.
4′ 1″ or 4′ 1½″ (with later tyres) diam., 12 rect spokes, rectangular inner rim, 4″ apparent tread.
Hub 12″ face dia., level with the tyre.
Casting: 28.9 mm tread dia., 24.2 mm i/d., hub level with the tyre.
Casting prices and stock . GWR loco sets, price list
Scan of the castings in sets for a GWR 4-4-0 Armstrong.
4 Feb 2015