Then there's the quality of the tubing used in construction, finding a frame of double butted tubing or Reynolds tubing is few and far between. They are also a more flexible frame, though the double butted mixte Nishiki Olympic 12 I had was a fine bike for bumpy trails where its frame flex took a lot of the edge off the road shocks. I am awaiting a loop frame (double tube ladies) to see how different it rides compared to the Olympic 12. Nice thing about these bikes are the brazeons most have for fenders and some even have double for fenders and a rear rack. They make a nice commute/pick up the groceries bike and often have clearance for 32cm/1 1/4" tires which really make a difference. Good luck on your restoration.