Hi Neil...the 94 mm front was standard on vintage CCM fixed-road/track bikes. The rear track ends are 120 mm. These bikes are british standard in many respects. These frames date from 1930 to 1950.
Many hubs were made to accommodate these dimensions. BH (amongst others) made a large range of widths.
>Any ideas why the front and rear dropouts on my
>1955/56 Armstrong Pathracer would be spaced at
>Someone once suggested they are standard French
>track measurements(and I do have a vintage French
>hub with 94mm OLD)which I can't really argue
>with, but the bike is British through and through
>in every other respect...threading, tubing, place
>of manufacture, etc.