4′ 0″ diam., 12 rectangular spokes, rectangular inner rim, 4″ apparent tread, 5½″ tyre width.
Hub 11″ face dia, 1½″ out from the tyre, pin in line at 8″.

Source: No 662, Martello at Bressingham, Feb. 1974.

Casting: 53.9 mm tread dia., 45.2 i/d, hub 1.7 mm out from the tyre, pin at 9.0 mm.
5½″ tyre width at this scale = 6.2 mm.

Gauge 3 loco set prices . Casting prices and stock

Loco set information and Photos of Martello at Bressingham.

Suitable for the Gauge 3 Society 2010 minimum tyre width of 6.8 mm, or the earlier standard of 8.0 mm.