I have a Nishiki Custom Sport from the early 80's. It has a nice chromo frame and a nice Sugino GS crankset. It also had alloy wheels, but they were trashed. The cranks and frame were worth (to me) what I paid.
Can you post some pics...........it would really help in determining if it's worth rebuilding/upgrading.
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Be where your feet are.......Lisa Bluder