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garbaruk says pretty specifically that the cages are only for the 1x grx rd. i was unaware of a way to extend the cage length of the grx 2x rd.
i've also run 50-34 x 11-40 for a number of years, first with mechanical using a roadlink at first and then a tanpan with an xtr sgs rd which worked pretty well. w/ di2 i used an rx rd and also the grx 2x rd. i think with all these setups except the tanpan you can tell that the rd is over capacity, and if you are descending chunky stuff while in the big ring + small cogs you get a lot of chain slap plus occasional chain drops which i can't help but think would be avoided by a longer cage rd + some extra tension.
zmjones_
hippy
I'm already at the limit with mine. I mean, I was going to try the 46T but didn't get around to that. What I really wanted to do was get a 51T MTB cassette with an MTB Di2 RD keeping the 46/30 P2M up front.
I could probably use Gerbaruk stuff to do this (longer cages for Shimano) but I thought maybe there was a way around the weird di2 limitations.