Originally Posted by
tomtomtom123
You could switch the road BB cups to mtb BB cups. That would make the overall BB width 2mm shorter, and bring your chainline 1mm inward. You'd have to shave the plastic stops on the water sleeve so that they'd fit in between the mtb BB cups while on the narrower BB shell. The left crank arm probably has enough tolerance to eat up the extra 2mm of spindle protrusion, and you get 2mm narrower q-factor.
I could see how that might work. At least the GRX FD and FD adapter aren’t a huge expensive so hopefully those will do the trick.
I’m surprised I couldn’t adjust the high limit on the R8000 FD out more but I guess that’s why Shimano is making the GRX FD....