6′ 8″ diam., 20 spokes, rectangular inner rim, apparent tread 4¾″, tyre thickness 5⅜″.
Hub 21″ face dia., pin between at 13″, hub is level with the tyre.

Sources: No 4472 measured direct at Llangollen in Feb. 1995.
O.S. Noch, British Locomotives of the 20 th Century, vol. 1: page 219, detailed works drawings.

Casting: 63.5 tread dia., 55.9 i/d, hub level with the tyre, pin at 10.3 mm.
Tyre thickness for exact scale modellers: 5⅜″ at 1:32 = 4.3 mm.

Casting prices and stock . LNER loco sets, price list

Scans of castings in sets for:
LNER 4-6-2 A3 with prototype images, 4-6-0 B17 (GE tender), 4-6-0 B17 (LNE tender).