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TTM
Grumpy_Git
Surely going 2x.
If you have a GRX 800 crankset all you'd need is 46/30 chainrings and a FD (any shimano 11s would work). Assume levers are GRX, so should be already 2x, just need the cable. That way your lower gear would be 30x42, and don't have to change cassette.