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Went out with the OH today and had a bit of a mechanical on her bike. Changing down to first gear (biggest cog), it sticks open. Changing back up, the cable goes slack and it's like the spring isn't strong enough to pull the derailleur back across the cassette. Not sure as this is a new problem either, it's been sluggish to change for a while.
Got it home and cleaned a monumental amount of crap off it, it seems 'better' but it's still not 100%. Is this going to be just a case of making sure it's clean and lubed properly, or is there something else I should be looking at?
Cheers.
try cleaning the cable or a new cable. Most likely culprit
TJ he said
the cable goes slack
check b-tension screw & that pivots move cleanly
how close to the big cog on the cassette is the top jockey wheel? if it's too close it could prevent mech pulling the chain down to the next cog. to fix it you need to tension the spring which is coiled around the bolt which clamps the mech to the frame - there's a little screw that faces forwards (not the High / Low limiters).
failing that, could be crud in somewhere in the cabling!
Al - I assumed ( perhaps wrongly) cable goes slack by the lever due to it sticking in the final bit by the mech which is where they usually stick
cable change 1st - if its not been serviced the inner (last section )will be furred up I bet or it'll be kinked in the shifter 🙂
check b-tension screw
Ah, yes, I've heard of that but need to look it up, I'll hit my books.
how close to the big cog on the cassette is the top jockey wheel?
Pretty close, now you come to mention it.
you need to tension the spring which is coiled around the bolt which clamps the mech to the frame - there's a little screw that faces forwards (not the High / Low limiters).
Is that the same thing as above? Sounds plausible.
Pretty sure the cables are fine, from what I can see.
You say the cable goes slack. Front end or back? It's not the cable if the cable's going slack at the back end - if the shifter is giving slack and pushing a loop of cable out the back but the derailleur isn't taking it, you're right in thinking it's a sticky derailleur.
Is it an SRAM X-9? My X-9 used to do exactly this but it's fine now. You can't dismantle the mech but you can remove it, clean it thoroughly and soak it in GT85. Keep blasting it with GT85 after every ride and eventually it'll free up. For the record, my X-9 also wouldn't go into 9th without a bit of a bunny hop to clatter it into submission.
Front end or back?
Back. If I go from 1 to 9, I can grab a handful of cable next to the chainstay.
Is it an SRAM X-9?
Ooh. Yes. yes it is. Innnnteresting.
I had 1 that did this got onto fisher they said known problem return to shop they had a batch that did this give them a bell if you bought it in last 9 months or so. Still have not returned mine though can't live without my bike for a few days....
Oh? Ok, cool. It's going back to the LBS for its initial service (only about three months late *coughs*) in a couple of weeks; I'll ring 'em to preempt them so they've got stock.
Awesome, thanks guys; I thought it was just me being a 'tard.
Oh look.
http://www.singletrackworld.com/forum/topic/help-needed-my-x-9-rear-mech-sticks-in-1st
That's only exactly the same fault, then.
And,
http://www.bikemagic.com/forum/forummessages/mps/dt/4/UTN/94655/last/1/V/6/SP/
http://www.mtbrider.com/showthread.php?24230-SRAM-X9-problem
etc etc. It's broke, ergo going back.
Just rang the LBS.
"Is it the X9? Yeah, there's a recall on these, bring it in and we'll swap it."
Win. Thanks again, folks.