Sram X01 Type 2.1 11 Speed Rear Derailleur
The same technologies that make up the XX1 rear derailleur are also available in the less-expensive X01. SRAM's Roller Bearing Clutch that decreases chain-slap, and its Cage Lock technology that makes removing and replacing the rear wheel a breeze. The proprietary X-HORIZON design makes all SRAM 1x derailleurs unlike typical derailleurs. Most derailleurs are designed such that the knuckle is slanted, versus the side-to-side motion of the X01, which limits the movement to the horizontal axis and makes ghost shifting nonexistent. An offset upper-pulley wheel is also unusual in the design, providing a constant chain-gap through all gear ratios to keep chain tension uniform so prevent binding and slapping. The chain is tensioned with the derailleur and locked in place with the pulleys and chainring, effectively making dropped chains and missed shifts things of the past.
Material - Bearings = Steel / Hardware = Aluminum / Body & Cage = Carbon
Weight - 252g
Range - 10-42
Largest Front Chainring - 34t
Warranty - 2 years