B480 leading drivers, B481 mid drivers, B482 rear drivers.

6′ 7″ diam., 22 oval spokes, vee inner rim, apparent tread 4¼″.
Hub 17½″ face dia., 3½″ out from the tyre. Pin between at 13".

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

Casting: 46.1 mm tread dia., 40.9 mm i/d., hub 2.0 mm out from the tyre. Pin at 7.6 mm.
Casting prices and stock . SR loco sets, price list

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