The Ultegra RD-R8000 11-speed Rear Derailleur is one component which features some significant changes from the previous Ultegra 6800 version. The new Shimano Ultegra R8000 rear derailleur now sports the Shadow low-profile design that not only increases shift stability, but also reduces crash vulnerability. This particular version of the R8000 rear derailleur is the mid-cage GS edition, designed for wider range cassettes, and can handle cassette cogs up to 34T in size.

bicycle rotor durability-Shimano Ultegra RD-R8000 11-speed Rear Derailleur
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