3′ 6½″ diam., 10 rectangular spokes, rectangular inner rim, 3″ apparent tread.
Hub 12″ face dia., ½″ out from the tyre.

Source: GER Locomotives in Locomotive Magazine, figs. 76, 82. Some dimensions estimated.

Casting: 33.3 mm tread dia., 28.3 i/d, hub 0.4 mm out from the tyre.

Scans of a casting in a set for an ECR/GER 2-2-2 Sharp Single.