Sram x01 11 speed rear derailleur
The sram x01 rear derailleur 11 speed provides an incredible shifting action thanks to its all new horizontal parallelogram design this in effect ensures that the chain gap is kept equal across all 11 of the gears for super efficient and powerful shifting the new horizontal design eliminates all vertical movement from the derailleur this allows for a much quicker shifting action that is also reliable and more powerful than ever before with the combination of the roller bearing