Shimano 6-12 Speed Rear Derailleurs Option:12 Speed for 2x12 the Frena won't stretch out

the Frena won't stretch out

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Shimano 6-12 Speed Rear Derailleurs Option:12 Speed for 2x12 the Frena won't stretch outDEORE XT Di2 RD M8050 GS (Medium Cage Length) ,11 SPEED, TOP NORMAL SHADOW PLUS DESIGN, DIRECT ATTACHMENT (DIRECT MOUNT COMPATIBLE) Perfectly suited to a wide variety of MTB applications, the M8050 DI2 version offers the digital precision of SHIMANO electronic shifting. Accurate and stable shifting in any condition Instant response Customized shift speed within Multi shift Powerful shifting Seamless gear change even under high load Smart and efficient