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I keep getting a mech "pulling" problem in watery muddy conditions, the conditions don't have to be that bad for this to happen.
As I pedal in middle front ring the mech cage rotates anti-clockwise, so the bottom jockey moves forwards, the chain slackens up and drive train either locks up completely or the chain will suddenly pull through.
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I thought this was down to friction in the top jockey, but I have installed new sealed jockeys and still get the problem, the chain and rear sprockets are newish.
This has happened on my last 2 bikes (Stumpy FSRs) as well as this one (Epic FSR), other people I ride with don't have this problem in similar conditions. Any ideas? I saw another guy on an Epic with the same problem at Kielder (i had this problem at Kielder but also in much less severe conditions), so wondering if this is a something like a chainline issue?
'Trying to imagine it?
Is it the bottom run of chain that's 'slack' when this happens?
Have you tried swapping back wheels to make sure its not a freewheel issue?
Hi Stuey
Yes, ths bottom line goes slack.
Happens with Hope, DT and Shimano freehubs.
This 'feels' like chainsuck - but swapping chains and rings is a pita. - you could try checking the middle ring and chain for any snags or twists to file or straighten.
Have you ever clouted your mech?
I smacked my mech hard enough to break a jockey wheel but managed to get it straight enough to run it without any issues however after recently renewing the cassette, chain and chainring I started to get similar problems to what you're describing
I eventually bought a new mech and hanger and the problem disappeared so I assume something wasn't quite straight somewhere.
This is on a 2010 stumpy by the way.
Stiff link?
solved this problem,
even though my middle ring wasn't that worn, I bought a Middleburn slickshift middle ring, had a trouble free day at FoD Enduro, happy days