5′ 2″ diam., 14 rounded vee section spokes, rectangular inner rim, apparent tread 3.65″.
Hub 21½″ face dia., 5¼″ out from the tyre. Pin between at 15½″
The large weight (P401) is ¾″ above the hub, the small weight, P400 is 1⅞″ below the hub.

Castings: 49.2 mm tread dia., 43.4 mm i/d., hub 4.1 mm out from the tyre.
The large weight (P401) is 0.60 mm above the hub, the small weight, P400 is 1.49 below the hub.

Casting prices and stock . USA loco sets, price list