NEW Shimano RX100 #RD-A550 rear derailleur from 1992 NOS/NIB – Velosaloon.com
SHIMANO RX100 RD-A551 long cage rear Derailleur. | eBay
Rear derailleur Shimano RX100 RD A550 in second hand condition
Vintage Shimano - RX100 rear derailleur on the vintage Shimano service bench. These are basically identical to 105 1055 apart from the polished finish. | Facebook