6′ 8″ diam., 22 oval spokes, rect rim, apparent tread 4″.
Hub 20″ face dia., 2″ out from the tyre.

Sources include published photos and dimensions with some dimensions estimated.

Casting: 46.7 mm tread dia., 42.0 mm i/d., hub 1.1 mm out from the tyre.

Casting prices and stock . SR loco sets, price list

Scan of a casting in a set for a SR 4-4-0 L1.