4′ 3″ diam., 12 rectangular spokes,very low inner rim. The tyre does not overlap the wheel center.
Hub 14″ face dia., 1⅜″ out from the tyre.
Sources: drawings by E.W. Twining and by M. Sharman (M. Sharman, The Crampton Locomotive, 1983.)
Casting: 57.3 mm tread dia., 49.8 mm i/d., hub 1.7 mm above the tyre.
Note: the inner faces of the tyres were level with the outer surface of the wheel centres - without any overlap on the front, and so without any step down to the internal diameter of the wheel.
9 Apr 2013