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If you’re not ready for the wholesale upgrade to 11-speed drivetrains (derailleur, cassette, chain, wheels!) then take a look at the SRAM X9 Type 2.1 Rear Derailleur when your current shifting bits give up the ghost. It packs in a lot of precision, anti-chain-drop tech into a backwards compatible rear derailleur.

The Type 2 in the name refers to SRAM’s clutched rear derailleurs, meaning that it’s set to provide a certain amount of friction at the pivot, which reduces the frequency of dropped chains, even when running a one-by setup.

  • Compatible with ten-speed drivetrains
  • Roller Bearing Clutch
  • Cage Lock technology
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Great Update

  • Familiarity: I've put it through the wringer

Rear derailleurs get a lot of use, and a lot of wear and tear. When the time came to replace my bike's original X0 rear derailleur I went with the new Type 2.1-equipped X9. The clutch greatly reduces chain slap and with a minimum of extra effort at the shift lever. I have always loved SRAM's precise, mechanical-feeling shifting and the clutch seems to emphasize that positive engagement.

No drop

  • Familiarity: I've used it several times

Don't drop that chain with the type 2.1 rear derailleur. Great quality, great shifting performance, and the new type 2 is fantastic and keeps the bike quiet. I have these on a few bikes and would purchase again!

^ what they said

  • Familiarity: I've put it through the wringer

I'm not a tech, so I can't go off on how great this RD is. I used to have the X9 and have bashed it up and was needing to upgrade. I liked everything about the X9 so I just went for the same thing, but better. So far so good. I think I've noticed less chain slap...