4′ 3″ diam., 12 oval spokes, vee inner rim, 4″ apparent tread, 6″ tyre width.
Hub 16″ dia., ½″ out from the tyre.

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

Casting: 40.5 mm tread dia., 34.2 mm i/d., 0.5 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