I have an old TT Bike I use for my Tacx Neo, it has a 54/40, 11/28 setup.
I am a bike maintenance novice but somewhat handy
When I am in the big ring and I shift up to the 3rd smallest gear it jumps back to 4th. I canâ€™t get it to go higher without noises and jumping
I took The bike off, put it on a stand with 11/28 rear wheel and adjusted everything so it worked great and shifted fine on the stand
When I put it back on the Tacx same problem. Also when Iâ€™m in small chainring and 28 tooth it seems to rub a little. Itâ€™s almost like the cassette needs a spacer to shift everything a bit to the right
When I try adjusting the DI2 on the trainer I canâ€™t get it right. Sorry if this isnâ€™t clear but any help appreciated