Just to say. I've added (temporarily) a couple of extra links with quick link connection and that does seem to have solved the problem. I just wanted to make sure before I go ahead with a larger cassette.
With that in mind, do you think that my system would be okay with an 11/40 cassette? Bearing in mind that I have oval 30/46 on the front. Or might you expect chain wrap.
Grx400 rear mech, 105 front mech, oval 30/46 chainrings.
Cheers.