Mountain Bike Reviews Forum banner

What's wrong with my derailleur?

514 Views 3 Replies 4 Participants Last post by  leoh
Hello everyone, a couple of months ago I was riding my Ibex Asta X7 on the trails as usual when something weird happened all of a sudden. Right when I got to the bottom of a big hill my bike began acting weird.

The rear derailleur no longer works at all, when I try to change gears there is no resistance at all on the lever and it does nothing. I have Sram X7 derailleur and shifters as well.

Does anyone know what the problem is, do I need new wiring or to simply readjust the derailleur?

Any help is much appreciated.
1 - 4 of 4 Posts
many things could be wrong. The housing could have come out of the end stop, or split in some way. The inner cable could have broken. The pinch bolt that clamps the cable could have been too loose. the shifter internals could be messed up.

I can only guess.
Twenty to one something is binding the cable. It isn't rare for mud or dirt to get into the short housing length from the chainstay to the RD, or one of the other short sections. If the bike has been idle for a while and has a steel noodle, it might have rusted enough to bind the wire. Since the lever can only pull the cable and not push it a sticky cable acts exactly as you describe. The second possiblilty is that the return spring on the RD broke or got dislodged.

Either way, once you pull the RD to the low gear position, it's there for the duration.

Diagnose/clear it by pedaling and pulling the derailleur outwards at the same time to get it back to the outer (high gear) cog. Check the spring by pushing it in slightly and seeing if it springs back, if it does start checking the cable section by section. Odds are you'll have to disassemble the cable and flush out each section of housing. Good luck.
I'd check the cable. It's probably broken somewhere.
Check if the cable moves at the derailleur when you shift. If it doesn't, then it's broken.
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.