4′ 2″ diam., 12 oval spokes, rectangular inner rim, 4¾″ apparent tread.
Hub 14″ face dia., level with the tyre.

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

Casting: 39.7 mm tread dia., 32.1 mm i/d, hub level with the tyre.

Casting prices and stock. GN loco sets, price list

Scan of a casting in a set for a GN 4-4-2 Atlantic