Sram X.4 Single Trigger Shifter 8 Speed RearThe Sram X.4 Single Trigger Shifter 8 Speed Rear is compatible with ESP 1:1 ratio rear derailleurs only. The Updated over SX4 with dual-lever design mimics top-end models. The Compact housing with StraightShot cable replacement system pairs with the composite construction with gear indicator window in front of bar clamp. Not integrated with brake lever to allow use with various brake options. Includes cable and barrel adjuster. This is the 8 speed rear shifter only for a triple system. Weighs 130g.710845609589