1050 mm = 3′ 5½″ diam., disc with cast weights. 140 mm = 5½″ tyre width, 2½″ apparent tread.
Hub 360 mm face dia., 14.5 mm out from the tyre, pin between at 250 mm.
Tyre width for scale models: 4.4 mm.

Source: works drawings and photographs.

Casting: 32.8 mm tread dia., 27.6 mm i/d., hub 0.5 mm out from the tyre, pin at 7.8 mm.

Casting prices and stock . Russian loco sets, price list

Scan of a casting in a set for a Russian 9P class