3′ 1″ diam., 10 oval spokes, vee inner rim, apparent tread 4″.
Hub 12″ face dia., ½″ out from the tyre.

Sources: Works drg in Noch, Great Locos of the SR p. 143 and various published photographs.

Casting: 21.6 mm tread dia., 16.9 mm i/d., hub 1.2 mm out from the tyre.
Casting prices and stock . SR loco sets, price list

Scan of a casting in a set for a SR 4-6-0 Lord Nelson