6′ 9″ diam., 21 oval spokes, vee inner rim, 4″ apparent tread, 5½″ tyre width.
Hub 20½″ face dia, 2″ out from the tyre, pin between at 14″.

Source: Duchess of Sutherland measured direct at Bressingham, Oct. 1994.

Casting: 64.3 mm tread dia., 58.0 mm i/d, hub 1.6 mm out from the tyre, pin at 11.1 mm.
Tyre widths for exact scale models at 1:32, 5½″= 4.37 mm.

Casting prices and stock . LMS loco sets, price list

Scan of a casting in sets for a LMS 4-6-2 Duchess class