6′ 8″ diam., 20 oval spokes, rectangular inner rim, 4½″ apparent tread, tyre width 5¾″.
Hub 18½″ face dia., 1¼″ out from the tyre. Pin between at 11″.

Source: No 251 measured direct at NRM, York in August 1995.

Casting: 66.7 mm tread dia., 59.6 mm i/d, hub 1.2 mm out from the tyre, pin at 9.2 mm.

Casting prices and stock . GN loco sets, price list

Scan of the castings in a set for a GN 4-4-2 C1 Atlantic with a model photograph.