This example shows a tyre width of 3.5 mm for Gauge 0 Fine.
For Scale7 remove more metal from the back of the wheel to give a tyre thickness of 3.2 mm instead of 3.5 mm.
5′ 2″ diam., 16 oval spokes, apparent tread 4¾″.
Hub, 20″ face dia., level with the tyre.
Sources: RCTS Locos of the LNER.
Locomotives Illustrated No 120.
North British Steam Locomotives. P.110 works photos showing low vee rim on the driven wheels.
Casting: 36.2 mm tread dia., 30.6 mm i/d., hub level with the tyre.
Casting prices and stock . LNER loco sets, price list
Scan of a casting in sets for LNER Thompson/Peppercorn K1, Thompson L1
27 Mar 2013