On my specialized I have a triple 105 setup. When I am out of the saddle and cranking hard and in the middle or big ring sometimes it seems like the chain disengages for just a split second, I don’t know how else to describe it. I was looking down when it happened once and it didn’t seem that he chain tried to slip over into a different gear on the cassette, it just looked pretty normal.
I know this is slightly vague, but does anyone have an idea of what might be causing this?
Thanks