The SRAM 11-speed MTB rear derailleurs from the XX1, X01 and X1 series
Sram XX1 rear derailleur, Type 2.1, long cage, colour black-red, 11-speed
Sram X01 rear derailleur, Type 2.1, long cage, 11-speed, colour: black and red
Sram X01 rear derailleur, Type 2.1, long cage, 11-speed, colour: black
Sram X1 rear derailleur, Type 2.1, long cage, 11-speed, colour: black
