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Thanks - that has told me most of what I need to know!
I'm sticking with 11-speed because I want to be able to charge when I'm riding. I don't do it often but when I need to do it, I really need to do it! Also it means less kit to upgrade. Actually, I'm not sure about that - maybe my my current mechs / battery would work with 12-speed...? Either way, charging on the go is a big one and I have a bunch of half-eaten 11-sp cassettes which definitely wouldn't work.
frank9755
If you can try both then that’s probably the way to go. With the new Di2 Ultegra you can adjust the reach of the brake lever, not sure if that’s true of GRX. Di2 shifters feel a lot smaller than cable shifters to me, which may be better for smaller hands.
Probably not. I’ve used Hope calipers with 105 shifters and honestly couldn’t notice any difference between the 105 calipers that were on the bike previously. Ultegra Di2 and GRX Di2 are the same level in the Shimano range so they probably perform equally well.
If you can fit a 160 up front then I would go for that, especially if you want to also use the bike for gravel.
Centerlock, 12mm axles, flat mount brakes. That’s what you want.
You probably won’t need to. Pads last aaaagggeeess and, unlike mechanical disc brakes, hydraulic ones don’t need adjustment as the pads wear. I didn’t touch the hydraulic Shimano brakes on my road bike for like 10,000 miles other than to change pads every now and again.