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That post was 2 years ago. I can't remember what I was trying to do but probably keep a powermeter on my bike and give her bike lower gears.
For what its worth, she has GRX cranks on both her bikes now and I took her old FSA cranks for the Tripster in Poland.
I've also bought myself a GRX 1x crank for the Surly to replace the 32T Middleburn cranks that are on there but a bit low geared for what gets mostly road use.
Why not GRX 600?