I have “upgraded” from XTR 3×10 to XT 1×11 on my Cube Stereo 120. However I cannot get the derailleur to shift across to the 40 cog unless I push it with my hand. I cannot tighten the cable anymore or the shifter will not release.

What am I doing wrong?

You’ve adjusted the limit screws?

Chain long enough?

Limit screws and the b screw moves the mech away or towards the cassette, if its too close wont shift into largest ring so easily.

Yep limits, b tension or just a balls up with the cable. Pick one, test all 3 and come back…

B tension screw needs winding in more by the sounds of it.

Play with the screws, all of ’em. 🙂

Worked for me.

Easiest with the chain off too.

Needed to take off dog leg from the mech for my bike.

Thanks for all your suggestions though.

Case closed. 🙂