Shimano 105 RD-R7150E Di2 Rear Derailleur - 12-Speed For 2x12 Speed Direct Mount BLKShimano 105 RD R7150E Di2 Rear Derailleur 12 Speed For 2x12 Speed Direct Mount Black. The Shimano 105 RD R7150 Di2 12 speed rear derailleur completes a shift in the blink of an eye with its high performance motor and optimized link structure. This is the hub of the Shimano Di2 system with the charging port indicator LEDs adjustment switches and more integrated into a compact package. Low profile Shimano Shadow RD design reduces damage from contact and