This example shows a tyre width of 3.5 mm for Gauge 0 Fine.
For other standards remove more or less metal from the back of the wheel to give your chosen tyre width.
600 mm (1′ 11½″) diam., 7 oval spokes, rectangular inner rim, apparent tread 66.5 mm.
Hub 185 mm face dia., 6 mm out from the tyre.
Source: works drawing.
Castings: 13.3 mm tread dia., 10.4 i/d, hub 0.1 mm out from the tyre.
Casting prices and stock . Swiss loco sets, price list
Scans of a casting in a set for a Furka Overalp Bahn HG 3/4
2 June 2018