Campagnolo xenon 10 speed rear mechthe dimensions of the xenon rear derailleur cage have been slightly modified in the 2008 range to interface with the 10x chain which is narrower than the 9x one it is available in short and medium cage versions depending on the drivetrain it will be used with featuresweights short 253gmmedium 258gm buy campagnolo componentsfrom chain reaction cycles the worlds largest online bike store