Roadlink Rear Derailleur Part

• The RoadLink is optimized for use with ten or eleven-speed 11-36t and 11-40t cassettes
• 11-42 or 10-42 setups are not supported
• Works with all 10-11 speed Shimano and SRAM Road Derailleurs
• Best used with Single or Double Setups - see manufacturer's site for more details