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1:8 scale
Plain wheels for the SAR spoked bogie wheels.

2′ 10″ diam., 10 oval spokes, rectangular inner rim. Tyre width, 5″.
Hub 10½″ face dia., 1″ out from the tyre. (Some dimensions estimated).

Casting: 108 mm tread dia., 85.9 mm i/d., hub 1.6 mm out from the tyre.

Narrow gauge loco set prices . Casting prices and stock

Source: works drawing for class 16E bogie wheels.

It is also suitable for a 4-8-2 class 23 bogie wheel.
It may not suit 15F trailing wheels, as these are mostly, if not always discs.

Scan of casting S104

Cross section diagram of casting S104

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22 Jan 2016