3′ 3½″ diam., 10 oval spokes, rectangular inner rim, 4″ apparent tread.
Hub 10½″ face dia., ½″ out from the tyre.

Casting: 31.35 mm tread dia., 25.1 mm i/d., hub 0.4 mm out from the tyre.

Source: reduced works drgs. in O.S. Nock 'The Royal Scots'.

Casting prices and stock . LMS loco sets, price list

Further information.   Scan of a casting in a set for: BR Diesel class 41