GTs58, thank you for the information. Currently the bike has Simplex derailleurs and Suntour Power down tube shifters. I know the shifters were added but unsure about the derailleurs. I believed the brakes were also changed, to MAFAC "RACER". The jockey wheels on the Simplex rear derailleur need to be replaced, so I was thinking of swapping it out with a used derailleur I have. My question is, which one of these used derailleurs would be close to the original the bike came with and which one is the best out of the bunch? Thank you
Shimano Eagle
Shimano Eagle 2
Shimano Tourney
Shimano Skylark
Shimano RS
Schwinn Approved (made in France)
Schwinn Approved GT510
Suntour GT
Suntour U
Suntour 7GT