Eddie Miller
Look Ma, No Hands!
I talked to a guy at a bike shop in Kalamazoo, and he said it wasn't unusual for Schwinn to use up leftover parts on new bikes. So maybe those were original from the factory, they just needed to liquidate old, unused parts. I guess I can just call it a custom '71 Schwinn Racer.I vote for scenario #1. If you want to go further, see if the crank was changed out along with the chain ring. There should be a cast in date on the crank.