A friend has offered to sell me his road bike, and I want opinions as to what's a fair price. It's an early 1990's Centurion Iron Man. The frame is too big for me (60+cm) but if I recall correctly, it's all Shimano 600. I doubt it has 500 miles on it. I'll be keeping everything but the frame, and looking for a suitable 56cm steel frame to build up with the parts. Any idea on what it would be worth? I was with him when I bought it, but since it wasn't my wallet opening, the sale price has escaped my memory after all these years. Oh, the frame is light green and white, from what I remember. Any help is appreciated.