Shimano Dura Ace Di2 RD-7970 Rear Derailleur
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★★★★★
★★★★★
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DESCRIPTION
Shimano Dura-Ace Di2 RD-7970 Rear Derailleur. The revolutionary Dura-Ace Di2 electronic shifting option with SEIS (Shimano Electronic Intelligent System) takes the already superior Shimano shifting performance to a whole new level never seen before. The i