6′ 8″ diam., 20 spokes, rectangular inner rim, apparent tread 4¾″, tyre thickness 5⅜″.
Hub 21″ face dia., pin between at 13″, hub is level with the tyre.
Sources: No 4472 measured direct at Llangollen in Feb. 1995.
O.S. Noch, British Locomotives of the 20th Century, vol. 1: page 219, detailed works drawings.
Casting: 89.9 tread dia., 79.3 mm i/d, hub level with the tyre, pin at 14.6 mm.
Scan of a casting in sets for LNER Gresley A1/A3 .
Suitable for the Gauge 3 Society 2010 minimum tyre width of 6.8 mm, or the earlier standard of 8.0 mm.
27 Mar 2013