Also, you need to take into account that changing an older frame to a suspension bike can change the geometry and the handling, rarely for the better. I made this change to a 1988 Nishiki Ariel, it did not work out well. The bike lost stability and wanted to crash every time I hit an obsticle. I've also added a sus fork to newer rigid bikes with success. These bikes had 1 1/8 heads and worked well with a suspension fork. The problem is, you don't know how a bike will react to the change until you make the change.