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10 mm/ft scale
BR 4-6-2 Britannia driving wheel.

6′ 2″ diam., 20 oval spokes, vee shaped inner rim, apparent tread 3½″, tyre width 5½″.
Hub 16½″ face dia., level with the tyre, pin between at 14″.

Source: preserved loco. 70013 measured direct at Bressingham.

Casting: 61.7 mm tread dia., 55.5 mm i/d., hub level with the tyre, pin at 11.7 mm.

Casting prices and stock . BR loco sets, price list

Scan of castings in a set for a BR Britannia a prototype wheel photo.

Scan of casting T71

Cross section diagram of casting T71

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27 Mar 2013