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Shimano 105 5800 Rear Derailleur GS. Now with 11 speed compatibility and technology borrowed from Ultegra and Dura Ace, the Shimano 105 RD 5800 GS Rear Derailleur has a new spring mechanism and cable pitch that provides robust adjustability for perfect alignment. Shifting action feels light and nearly effortless, even under heavy loads. Wide outer link design offers super stiff, smooth and precise gear changes while the medium cage design is compatible with 32T rear cogs for climbing and endurance rides.
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