Shimano 105 R7150 Di2 12 Spd Rear Derailleur - Black YGroup_sidi-sixty-high-performance-road-shoe-YG This size difference refers to

This size difference refers to the grip circumference

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Shimano 105 R7150 Di2 12 Spd Rear Derailleur - Black YGroup_sidi-sixty-high-performance-road-shoe-YG This size difference refers toShimano 105 Di2 12 Speed Rear Derailleur RD R7150 The Science of Speed The Shimano 105 Di2 RD R7150 introduces wireless shifting to a broader audience, delivering precise, lightning fast gear changes. Inspired by DURA ACE and ULTEGRA, it provides professional grade technology at an accessible price point. With wireless integration, sleek design, and innovative features, this rear derailleur redefines the road cycling experience. Key Features Compact