even if your rear was 126 you could still jam the 130mm wheel in there without major issues on your old steel frame. So you have a wheel, now you need a casette and shifters. chances are old friction shifters would shift all the way up to 10speeds. lets not forget, the casette hasn't gotten that much wider over the years, they've just jammed more and more gears into the same amount of space. I would recommend looking at Microshift brifters or their flat bar road shifters for an inexpensive set of road shifters if you want to go to 9 or 10 speed but that will probably mean you need a new crank because it may not play nice with 9 or 10 speed chains. IF you go to 8 speed you can look for 2300 or sora shifters that are 8 speed and not have issues with the crank as 8 speed chains are the same as 6 and 7 speed.