Shimano RD-7800 GS Dura Ace Rear Derailleur 10 Speed (Medium Cage) Shimano's best road derailleur for triples. This version utilizes Shimano's Wide Link design and 11T cartridge bearing pulleys. Compatible with all Shimano shifters (except 8sp DuraAce) and Shimano-compatible SRAM shifters.
- Largest cog is 27T.
- Chain wrap capacity is 37T.
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