SRAM X4 Rear Derailleur - 7/8/9 Speed

• ESP compatible (1:1 actuation ratio) for ESP trigger or twist shifters
• Di.R.T (Direct Route Technology) for light-effort shifting performance
• Alloy outer link and B-knuckle with Grilon composite P-knuckle
• Steel/composite cage with replaceable pulleys
• 7/8/9-speed compatible with top-normal resting position