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