5′ 4″ diam., 16 oval spokes, hump inner rim, apparent tread 4½″.
Hub 2″ out from the tyre, pin in line at 11″

Sources: Lyn D. Brooks, 'Updating Buckle' in Journ. GER Soc., 129:12-19 (Jan 2007).

Casting: 53.3 mm tread dia., 45.8 i/d, hub 1.6 above the tyre, pin at 9.2 mm.

Casting prices and stock . GER loco sets, price list

Scan of castings in a set for a 2-4-2T GER M15/LNER F4