Sram x01 eagle rear mech type 30this sram x01 eagle rear mech is equipped with srams type 30 roller bearing clutch feature which provides a more consistently quiet drivetrain and even better chain retention than the previous model although the x01 may not have the carbon fibre construction of the higher spec xx1 model it still retains all of srams top end technologies the x01 eagle rear mech has been completely redesigned and is equipped with the very best of srams drivetrain features