SRAM pulls out all the stops with the XX group and the XX rear derailleur is no exception. It features a high-polish outer cage with laser etched XX graphics, grey anodized cage attachment body, full carbon inner and outer cage, titanium return spring and ceramic bearings in both pulley wheels.
The engineers at SRAM started with a clean slate to engineer the XX rear changer and to that end, it was made to function with 2x10 drivetrain offering the best possible performance at the lowest possible weight. We have yet to see a better functioning rear derailleur from SRAM and perhaps what is more interesting to note is that it is incredibly durable. It also functions perfectly with a triple front crankset.