Suitable for:
the SFMES 13.6 mm, (0.535″) tyre width and 3.2 mm, (0.130″) flange depth.
or the GL5 standard of 12.7 mm, (1/2″) tyre width and 3.97 mm (5/32, 0.156″) flange depth
For 5½″ at this scale use 12.4 mm, 0.487″.
3′ 2″ diam., 10 oval spokes, rectangular inner rim, 4″ apparent tread.
hub ¾″ out from the tyre.
Source: measured direct at Loughborough in 1995 and GWR works drawing.
Casting: 85.5 mm tread diam., 66.0 mm i/d., hub 1.7 mm out from the tyre.
Casting prices and stock . GWR loco sets, price list
Scan of a casting in sets for GWR 4-6-0 Castle
21 June 2021