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SRAM XX1
X-HORIZON technology ROLLER BEARING CLUTCH technology CAGE LOCK technology X-ACTUATION technology 12T X-SYNC pulley wheels Silent pulley tooth design Weight: 220 grams (approx.) SRAM Model ID: RD-XX-1-A2 Attributes Max Front Difference Single chainring only Maximum Cog 42T Minimum Cog 10T Cage Long RD Weight 220g Speed 11 Mount Standard
Shimano Deore XT Di2 RD-M8250 Kit