OP here, I have successfuly swapped in a 42T narrow wide in the front and kept my 11-32 in the rear. I tried swapping in an 11-40 in the rear but the 105 RD did not like the 40T sprocket even though its a long cage. Im trying to figure out how others have done it with the 105. My opinion thus far is that even with the 42t, 11-32 combo, this setup is much better than the 2x11 I was running. I ride mostly pavement with grades from -2 to +2 so Im not losing any gearing if i can get the 11-40t in place i will actually have wider low end gearing and 2 cogs left on the high end