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Shimano Ultegra Di2 RD-R8150 Road Rear Derailleur Speeds: 12 Cage: GS Black IRDR8150A is backordered and will ship as soon as it is back in stock.
Shimano Ultegra Di2 RD-R8150 Road Rear Derailleur Speeds: 12 Cage: GS Black IRDR8150A