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SRAM X01
X-HORIZON technology ROLLER BEARING CLUTCH technology CAGE LOCK technology X-ACTUATION technology 12T X-SYNC pulley wheels Silent pulley tooth design Weight: 220g SRAM Model ID: RD-X0-1-A2 Attributes Maximum Cog 42T Cage Medium RD Weight 252g Speed 11 Mount Standard
Shimano Deore XT Di2 RD-M8250 Kit