Sram gx eagle boost 12 speed groupset includes gxp rear derailleur trigger shifter with clamp crankset gxp 12 speed with direct mount 32t x sync chainring chain 126 links12 speed cassette xg 1275 10 50t chaingap gage specifications rear derailleurmech simply put the new gx eagle derailleur extends the range of your riding because of its ability to handle the 10 50t eagle cassettebut theres more to this new derailleur than capacity the gx eagle derailleur includes the type 3 roller bea