Centurion Elite RS components
I just bought a very clean Centurion Elite RS, with the "Miami Vice" paint scheme, off of Craig's List.
The RD is a Shimano 105, which I'm pretty sure was not offered on these bikes at the time. I'm having trouble finding a good reference for the original components used on this ~30 year old bike, so I wondered if anyone knew whether some came with 105 parts? The crankset is Shimano 600, and everything else appears to be original, but the RD is throwing me off.