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7 mm/ft scale
B139, B140, B141
LNER Peppercorn A2 driving wheels.

6′ 2″ diam., 18 oval spokes, low vee inner rim, apparent tread 4¾″.
Hub 20″ face dia., central boss level with the tyre, pin between at 13″.

Source: 'Blue Peter' measured direct.

Castings: 43.2 mm tread dia., 37.6 i/d., hub level with the tyre, pin at 7.6 mm.

Casting prices and stock . LNER loco sets, price list

Scan of the castings in a set for a LNER Peppercorn A2

Scan of casting B139 Scan of casting B140 Scan of casting B141

Cross section diagram of castings B139, B140 and B141

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5 Sept 2017