X4, Rear derailleur, 7/8/9 sp, Long cage, Black cable & housing tools a methodical build and an

a methodical build and an advanced rim design

which yields better efficiency and feel than typical

Chainrings are compatible with SRAM 11 speed chains and YAW front derailleurs

Innovative Forced Air Cooling Technology sucks in incoming air and channels airflow around the head

These Hope Spiderless Direct Mount Retainer chainrings are specifically designed for use with SRAM 3-bolt direct mount cranksets

X4, Rear derailleur, 7/8/9 sp, Long cage, Black cable & housing tools a methodical build and an1: 1 actuation (SRAM shifter compatible) 9 8 7 speed system compatible Min cog: 11T Max cog 34T Front difference 22T max Total capacity : 45T SRAM Model ID: RD X4 A1