The X4 rear derailleur combines the best elements of SRAM shifting with a stylish design, all at an affordable price. Smart material selection results in a high-performance, lightweight derailleur. This is one option that will make you want to choose an 8-speed derailleur.FeaturesSpeeds: 7/8 SpeedMaterial: Alloy fork, Alloy outer parallelogram, Composite/steel clevis with replaceable rollersWeight: 280 g long cageOuter Clevis: SteelInner Clevis: Composite GrilonBearings : BushingClevis length : LongLong Clevis Speed 87