4′ 2″ tread diam., disc, apparent tread 4¾″.
Hub 12¾″ face dia., 1″ out from the tyre.

Casting: 39.7 mm dia., 32.1 i/d, hub 0.8 mm out from the tyre.

Casting prices and stock . LNER loco sets, price list

Scan of a casting in sets for LNER Gresley A1/A3 . Thompson A2/1, 8 wheel tender . P2