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: 25.25 mm tread dia., 21.5 mm i/d., hub 0.3 mm out from the tyre.

Casting prices and stock . LMS loco sets, price list

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