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  • Forged aluminum B-knuckle improves stiffness
  • Direct cable routing provides low-friction shifting
  • 1:1® actuation ratio delivers precise derailleur movement
  • Compatible with 8- or 9-speed cassettes


  • Save 10%! This item qualifies for our drivetrain bike part discount. See Details

View all SRAM Rear Derailleurs

REI membership


Best Use Mountain Biking
Derailleur Type Rear
Cage Length Medium / Long Cage
Max Rear Cog Size 43T / 37T
Speeds 8-speed, 9-speed
Weight 230 grams
Rated 5 out of 5 by from SRAM's Workhorse Have two X9s on mountain bikes-- shift great when set up correct (but thats the case for all derailleurs) , have taken a few beatings in crashes and running into PNW roots and rocks, and still going strong. Does require you to run Sram shifters, but since I've been running them since the late 90s, thats not a problem. I haven't run shimano RDs since, and I don't feel like I'm missing a thing. If you are looking for a solid rear derailleur, X9 is a great option!
Date published: 2010-05-22
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