SRAM X1 Type 2.1 11sp Rear Der Medium Cage Blk MFPN=11.6218.030.270 }Wheels Manufacturing M5 X 25mm

}Wheels Manufacturing M5 X 25mm Socket Head Cap Screw Stainless Steel Bottle/25

Medium width medium padding thickness

} Allows the use of a 7 speed Shimano cassette on an 8 or 9 speed Shimano cassette body

}Wheels Manufacturing BBright to Shimano Bottom Bracket with Angular Contact Bearings Black Cups

Low profile design with narrow carbon fiber injected shell for stiffness and light weight

SRAM X1 Type 2.1 11sp Rear Der Medium Cage Blk MFPN=11.6218.030.270 }Wheels Manufacturing M5 X 25mmSRAM 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