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Exact Actuation 11 speed shifting Aeroglide Pulleys Max tooth 28T for the short cage Max tooth 32T for the WiFli RD Forged aluminum B-Knuckle, magnesium inner link, carbon outer ca ge Weight: 178g Compatibility: 11sp cassettes and chains only SRAM Model ID: RD-FRC-B1 Attributes Max Front Difference 16T Minimum Cog 11T Primary Color Black RD Capacity 31T RD Weight 178g Speed 11 Show more