Recently my Shimano rear derailleur broke. I have Shimano Tourney front derailleur, and Shimano easy fire shifters.

Will there be any problem if I put SRAM X5 derailleur? The front is 3 and the rear is 7 speed.


It won't work. The two systems have different cable pulls.

Buy a SRAM (or Friction) shifter if you want to use the SRAM derailleur or buy a Shimano derailleur.

Either option is about the same cost (though if one is cheaper, the Shimano derailleur will probably be the cheaper one). You just need a 7-9 speed Shimano derailleur with sufficient capacity and cog sizes -- the Altus M-310 8 speed derailleur looks to be about 16 USD at the moment, which is probably adequate.


Just to clarify Batman's answer.

SRAM has the same pull ratio for front derailleurs as Shimano.

For the rear, SRAM has a different rear pull ratio (described by SRAM as 1:1 rather than 2:1) so each 'click' of an SRAM shifter will shift about two sprockets of a Shimano derailleur. Some SRAM shifters have a switch that allow you to convert to Shimano pull ratios -- and SRAM sells some shifters that are only-Shimano compatible.

However, since you're replacing the rear derailleur, I would stick with Shimano as SRAM doesn't sell any Shimano 2:1 pull compatible rear derailleurs.

  • Actually SRAM 7 speed (mountain) shifters pulls 4.5 mm of cable, while Shimano 7 speed shifters speed pulls 2.9 mm of cable so it won't be quite be two sprockets as you suggest (ref). SRAM (1:1) shifters also pull different amounts of cables by speed.
    – Rider_X
    Jan 11 '17 at 17:39
  • Yes, the exact amount isn't quite the 1:1 vs 2:1 that is commonly used in sram literature and bike shop lore. Thanks for clarifying. But I did just put a sram shifter on a shimano rd by mistake and it was roughly two sprockets per shift. I've hedged my answer.
    – RoboKaren
    Jan 11 '17 at 17:40
  • If you wanted to go 3rd party with Shimano ratios, Microshift is probably the way to go.
    – Batman
    Jan 12 '17 at 1:29

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.