Seem to have lost all the spring tension in my rear mech at the bottom two gears. The cable goes slack, but i can move the mech by hand and it goes into the gears no problem.
Can anything be done to adjust the tension or is the mech going in the bin?
It's a SRAM X9 (probably about 1000 miles on it)
It might be broken.
cheers 
Common problem, just had one replaced under warranty on a month old bike,lost count of the number we've sent back.Try taking it back to wherever you bought it from if it's fairly new.
Mine barely goes into top - spring has gone weak. Apparently you can't get replacement springs 
Is there any kind of bodge to fix it?
this is what generally spells the end for mechs in my experience, the spring goes and the mech goes all floppy, I've only ever bought a replacement because I've felt the mech is probably past its best
Hmm, my X9 has started to do a slightly similar thing in the bottom gear, but some repeated wiggling of the mech seemed to loosen it up and sort it.
I rode in the same mud as Retro, do you think it's something that is contagious?
ive got an x9 mech doing the same, just over 1yr old.
mines gone as well
what do you recon the chances of Halfords doing a warranty swap on it, when its now attached to another bike (not from halfords) are?
5lab - Member
what do you recon the chances of Halfords doing a warranty swap on it, when its now attached to another bike (not from halfords) are?
Slim to nil.
I'm thinking of replacing mine with X5. Weight difference is only 63 grams, so it works out at about a £ more expensive per gram saved compared to X5!
Never seen a Shitmano mech do this, Sram is certainly innovating!
wind the b adjust screw in lots - it alters the angle of dangle and i found this help when shift into little sprockets
low tension does seem to be a feature of x9
Never seen a Shitmano mech do this
2 weeks in Whistler destroyed my trusty 4-yr old XT rear mech AND the LX one I replaced it with - and that was just from the mech clattering around, not smacking it into anything
Don't throw that mech out - you can adjust the spring tension in SRAM rear mechs.
Follow the instructions on p44-45 of this SRAM technical manual: http://www.sram.com/_media/pdf/sram/dealers/MY10-SRAM-Tech-Manual-Rev-A.pdf
Is it not only X0 mechs that you can adjust the spring tension on?
I always leave my X9 mech set at the smallest sprocket when I leave put the bike away, and I've not had any problems with the spring tension. Someone once told me that this was a good idea re. the spring tension thing.
Same thing happened on my daughters boyfriends 2011 Marin Mt Vision, second ride and the X9 rear mech spring failed, not pleased soon fixed under warranty though 
Think I'll stick with the big S then!
As mokl, I was told ages ago to put gears in granny and top when putting bike away to lessen the spring tension in the rear mech.
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