hi terry ;
my cafe racer is fitted with a honda cb72 type 10" diameter approx TLS hub and 18" dunlop alloy rims but i dont know what it took to fit it all as it was something someone did in the late 60s .
all i can say is it fits fine and brakes fine , i also use old japanese alloy brake levers on the handlebars but im using dropped handlebars off a kh250 which are narrow , although it previously had some of those weird looking clip on type bars . .
i did look into trying smoething on my 7" AJS hub and the suzuki T20 tls 180mm brake might fit if i can pull the shoes in tighter by a small amount somehow , but i havent worked out if i will reduce the linings down or maybe the shoes somewhere .