Previously had an old 10spd SLX shifter and mech on 11-46 cassette, no problems that I remember.
Have put on a new chain and new 11-50 cassette with a hanger extender and just can't get shifting sorted.
Shifting up has becoming very heavy and shifting both up and down very laggy, ghost shifts etc. (Although of course seems ok on work stand!)
Chain line and length seem fine, stop screws and cable routing seem fine.
Guessing it could be mech spring getting old, but wasn't a problem before.
Any suggestions gratefully received!
with a hanger extender and just can’t get shifting sorted.
Buy a derailleur hanger alignment tool. It's astonishing how far out of alignment they usually are. A hanger extender will probably magnify that.
Previously had an old 10spd SLX shifter and mech on 11-46 cassette, no problems that I remember.
1. I don't think the 10-speed SLX mech will work with 11-46, so presumably you're using an 11-speed one? If it's a 10-speed mech it won't work with 11-46 let alone 11-50 even with an extender.
2. As above, hanger alignment.
3. Cables - if you've not changed them for a while, it's worth doing.
4. How are the jockey wheels? If the guide pulley develops enough sideways slop / later play, you can end up in a situation where the excess movement prevents proper shifting.
Definitely a 10spd mech and did work fine on the old 10spd 11-46 cassette, (which was one of those jobs where you lose the 13 and put on the larger sprocket).
Cables seem ok when testing with fingers.
Sounds like hanger alignment could be the issue,. although 'looks' fine by eye, so will try that next.
Cables is where I would start
Have you over lubed the cables? PTFE lined outers really don’t like some lubes. Inject brake cleaner down them to clean them out. Use a dry lube (not wax based) on the inners, making sure they’re dry before they go in.
Thanks all. Had enough of it for one day - cables and alignment tomorrow.
Is your chain significantly longer ie, heavier now? I have had laggy shifting when lengthening chains, if the bottom chain line has any droop see if you can wind some tension into the jockey cage this often helps. Equally as you say your self the parallelogram spring could need help as well .
Cables. It only takes one strand to become wayward to snag it all up...
I can't help with whether your mech. is being used too far out of spec. but when I replaced an SLX cassette and KMC chain like-for-like on my 3x10 bike recently, the shifting was all over the place (which surprised me).
Starting again from scratch with new limit screw positions and re-indexing and everything's been fine. No idea why there was such a difference.
Try some new jew jockey wheels
It's insanely frustrating. I've set up quite a few derailleurs in my time, so not being able to pinpoint it is weird.
Thinking maybe that the hanger extender isn't the holy grail I hoped.
Have you wound enough b-tension on so the upper jockey wheel has a few links between it and the cassette?
It's not you or a fault with your setting up, you're simply asking too much of your mech, it's designed to take what, a 36t cassette? No amount of extending the hanger is going to solve being 40% above the range it's supposed to do.
It's not the same symptoms but it's the same problem as the beloy. You might solve the slow shifting faffing with the b screw but you'll probably end up with a different problem instead, you'll solve that and end up with something else ad infinitum.
https://singletrackmag.com/forum/topic/what-bike-for-11-46-cassette/#post-12990000
Thanks for the link to that thread, had seen it, but not been into it and covers a lot of the issue. I'll try hanger alignment and cable, however as you say, it's likely just forcing a mech to do just do to much. It was ok on the old set up, but the link etc is just a step too far.
