3′ 9″ diam., 11 oval spokes, vee inner rim, 4″ apparent tread, 6″ tyre width.
Hub 14½″ face dia, ½″ out from the tyre.

Sources: Duchess of Sutherland measured direct at Bressingham, Oct 1994 and a works drawing.

Casting: 35.7 mm tread dia., 29.1 mm i/d., hub 0.6 mm out from the tyre.
Tyre widths for exact scale models at 1:32, 6″ = 4.76 mm.

Casting prices and stock . LMS loco sets, price list

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