6′ 2″ diam., 18 oval spokes, low vee inner rim, apparent tread 4¾″.
Hub 20″ face dia., central boss level with the tyre, pin between at 13″.
Source: 'Blue Peter' measured direct.
Castings: 61.7 mm tread dia., 54.1 i/d., hub level with the tyre, pin at 10.8 mm.
Scan of the castings in a set for a LNER Peppercorn A2
27 Mar 2013