1020 mm (3′ 4″) diam., 9 oval spokes, rectangular inner rim, apparent tread 2¾.
Hub 210 mm; face dia., level with the tyre.

Source: works drawing.

Casting: 31.9 mm tread dia., 27.5 i/d, hub level with the tyre.

Casting prices and stock . Switzerland loco sets, price list

Scans of a casting in a set for the Jura-Simplon A2/4 class