Just fitted new 11sp 105 mech and shifters about 6 weeks ago. Shifting started off lovely and crisp, a few days later it started to struggle on a couple of shifts … which I put down to the new cable stretching in. After a bit of adjustment it was back to shifting well.
However the past few days I’m getting poor shifting moving up the gear around the middle of the block. I click the shifter, and the mech moves outward fine, however it seems like the shifting ramps don’t engage for several revolutions of the cranks. Eventually it does shift. This doesn’t seem to happen towards end ranges of the cassette though.
Any ideas on where to start looking to fix? I’ve checked the limit screws and they seem ok, b screw seems ok too (I think).