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No, 1x is for MTBs only. My Mason Resolution is a road bike. It's 46/34 x 11-42 with Ultegra RD on a Wolftooth (not strictly necessary but I wanted to test it).
I think the DA Di2 FD doesn't have enough adjustment to move out the extra 2-3mm needed for the GRX crank's chainrings. I'll probably just get a GRX FD from Dolan unless anyone spots a cheaper/used one.
hippy
I had one of the Ultegra RX and swapped it out for a GRX 810, for the most part I think they are identical. I ran it with a 11-40T with some adjustment, and I’ve just got the GRX working 2x on a 11-42T. I’d imagine if you’re doing 1x on the Mason the Ultegra should cope fine
To answer your previous question, I’m using a CX70? (2x10 CX top pull derailleur) and it can shift into both rings on the GRX crankset fine, I guess with the Di2 you have less adjustability?
Edit: also re crank ideas, the Easton EA90 and they do a 48/30 or 46/30 gravel ring I think