NEW Shimano 105 RD R7150 Di2 Rear Derailleur 12 Speed, For 2x12 Speed, Direct Mount, Black height_5ft 09in Best used with Single An upward curved tail Best used with Single or Double Setups see manufacturer's site for more details Teeth provide space for mud to clear indicator LEDs 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
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