X1 Rear Derailleur - 11 Speed, Medium Cage, Black

The X1 group has all the important features of the high-priced spread with a modest increase in weight.

• Wide-tooth, narrow-tooth pulley wheel maximizes chain control by fitting inner and outer chain links perfectly
• X-Horizon design maintains constant chain gap across all gears and eliminates ghost shifting
• Roller bearing clutch eliminates derailleur bounce and chain slap
• Cage Lock feature simplifies wheel removal and chain installation
• Must be used with SRAM 1x11 shifter and cassette
• Cannot be used with double or triple chainrings