So I have a new bike, direct from manufacturer, had a little issue which was very swiftly/excellently resolved, but it meant that I didn’t ride it before the thing was sorted as I wanted to keep it clean before invisiframing it.
The thing that needed sorting meant I had to cut the gear cable, so I don’t know if it was set up and indexed all nice a smooth before I got my hands on it (I could have spun it in a stand but didn’t).
The thing is now for the life of me I cannot get the gears (Shimano SLX M7100 1×12) indexed, I’ve set up dozens of mechs from 8 to 12 speed inc converting my Trance to 1×12, never ever have I had so much trouble.
B tension is all set up and the cassette is in line with the line of the mech, checked a couple of youtube vids plus the Shimano manual.
If I have the indexing set up so I can get out of 12th gear into 11th it shifts ok, then into 10th is ok but catches a bit.
If I then try to change to 9th it goes straight to 8th. if I back off the cable a bit it’ll go into 9th, but then wont get out of 12th on one click. If I continue down the gears it’ll miss out gears and generally be shit, but it’ll sit in some gears ok, and which ones vary as I tweak the cable.
After 3 hours I cannot find a sweet spot where it’ll sit in all the gears and shift sweetly between them, its like the chain is too big (it’s not, it’s stamped M7100), I’ve even changed the cable.
Chainline looks ok, will sit in 1st no problem, in fact it will sit in 12 and 1st really well, just in between is awful.
Any ideas before I try to book it into a local shop for them to have a look (and wait another week or two to ride it)!?