Originally Posted by merlinrkd

Just picked up a '88' Centurion Accordo that has a replacement drivetrain. It has Sora Flight Deck 8spd triple STI shifters. The rear derailleur is a Tiagra medium cage that says 9speed on the jockey wheel arm. Shifting is a little sticky. Doesn't seem to me that the Tiagra is compatible with this. I vaguely recall that 7 Spd road rear derailleurs should work on 8 Spd.