I got the Dave Scott Centurion today for a whopping $40, it has some rusty spots and looks like it was used/loved a lot. It came with Shimano 105 gear and these cool ellipsoidal chain rings by Shimano called Biopace. Should I opt for round chain rings or just keep these? Since I didn't have shorter bolts to hold the chain ring on I "machined" some washers to fit where the smaller chain ring was so I could tighten on the larger one. Ghetto rigged that hardcore. I have the original chain but something makes me think I should buy a fixed-specific chain. I took it apart and cleaned it and then put it back together, now it's sitting in the garage awaiting wheels.