Revolutionary innovation,increased number of gears, good wear resistance index,make chain runs smoother and quieter.
Includes upper and lower pulleys with bearing plates.12T-positive and negative tooth,12-tooth pulley*2 and 1 measurement tool included.
Replacement wheel rear derailleur pulley guide set are Made of high quality plastic and steel shaft peilin for better durability,offers you a better cycling experience.
Compatible with S RAM XX1/X01/X1/GX/HX 11 Speed Series Bicycle.Simple design,Easy to install and operate,convenient to use,come with 1 measurement tool.
If there's any problem with our product or our service,please feel free to contact us directly,we are glad to help.