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• The Shimano Alivio RD-M3100 Rear Derailleur features Shadow RD technology to keep the derailleur safe from trail obstacles.
• Super low profile Shadow RD technology
• Largest Cog: 36 Drivetrain Speeds: 9 Cage Length: Long
• Chain Wrap Capacity (teeth): 45 teeth
• Rear Derailleur Mount Type: Shimano Rear Direct Mount , 10x1 Standard