Vintage Shimano - RX100 rear derailleur on the vintage Shimano service bench. These are basically identical to 105 1055 apart from the polished finish. | Facebook
Shimano RX 100 Brakeset STI 2x8 speed used | Retrobike
Shimano exploded views - RX 100
NEW Shimano RX100 #FC-A550 crankset with 42/52 teeth and 170mm length – Velosaloon.com