for LNWR Crampton 2-2-2-2 'Liverpool' at 1:22.6, 17/32″: 1 foot for Gauge 3
A full set consists of 2 x X289 leading wheels, 4 x X290 mid wheels, 2 x X291 drivers and 6 x X125 tender wheels.
Sources: drawings by E.W. Twining and by M. Sharman (M. Sharman, The Crampton Locomotive, 1983.)
Suitable for the Gauge 3 Society 2010 recommended minimum tyre width of 6.8 mm, or the earlier standard of 8.0 mm.