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.	
	
	
	
			
		3′ 10½″ diam., 12 rectangular spokes, apparent tread 3″, tyre width 5½″. 
  
		Hub 11″ face dia., 1″ out from the tyre.
Casting: 26.8 tread dia., 23.3 i/d., hub 0.6 mm out from the tyre.
Casting prices and stock . Australian loco sets, price list
Scan of a casting in a set for a NSWGR 4-4-0 Z12.
 
	
	
	27 Mar 2013