- chain jumping around on middle 3 sprockets…….help
Most likely cause is a slighty out of line mech. It only needs to be out a tiny bit. Even a new hanger can need a tweak to get it right, also check you tightened it to the frame properly, mine came ever so slightly loose which caused a similar thing. Check that first, then chech the other things metioned.Posted 5 years agobikebouyMember
+1 for another “mech out of line” answer.
Or try the cables, they may be dry in the outers and a good lube my just release that teeny bit of snag that could be making the inner “stick”.. Worth a go IMO.
Another, check the cable routage, have you a cable carrier thingy under the BB? Lube that too..Posted 5 years agochivesMember
Shimano chain? I had a joining pin that had sheared leaving a protruding bit which rode up on the next biggest sprocket (like a phantom shift). That was ten speed though. Or have you had a stone strike on the chain, opening a link slightly? Seems odd it’s in the middle of the block though (straightest chainline) my troubles’ always shown up on the smallest sprocket.Posted 5 years agoigmSubscriber
Ok in workstand, but not under load.
Does it matter which chainring you’re in? Is the chainline right?
You’re an old soldier so I assume you’ve tried pulling the chain backwards off the offending sprockets to check for wear. Pull it forward off the chainring too and it helps indicate whether it is the chain or sprocket at fault.
Had something similar once when I put the cable through the clamp on the mech slightly out of alignment (effectively got slightly wrong pull ratio) but I’d expect that to influence top or bottom sprockets not middle – and if you’ve changed shifters then you’d have had to have done it twice.Posted 5 years ago
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