rear derailleur x01 type 21 11 speed blackThanks to its horizontal parallelogram design, X HORIZON can keep the chain gap the same across all 11 gears. By vertical taking movement out of the equation, this design doesn't just make shifting fasterit reduces shift force and eliminates ghost shifting. ROLLER BEARING CLUTCH technology reduces bounce and chain slap. CAGE LOCK technology makes wheel removal and installation easier than ever before. Paired with the X01 shifter, the X HORIZON&trade
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