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Or am I talking nonsense?
Yeah.
GRX and 4700 tiagra share the same pull as 11 speed road and GRX.
Removing or using an 11 speed cassette doesn't affect things in the way you're thinking anyway. The pull from the shifter matches the derailleur. The spacing on the cassettes is already the exact same across the road/MTB range with cassettes. 10 speed GRX shifters work with any 10 or 11 speed road (or grav) derailleurs and whatever Shimano/SRAM compatible cassette you want that'll fit the capacity of the derailleur, which for GRX is bigger than Shimano claim, you could also pointlessly use an 11 speed cassette and not use the top or bottom cog.
snottyotter-
Haha, cheers @snottyotter that's super helpful. In your experience how much further than the Shimano claims can you push the rear GRX derailleurs? Is 42T do-able?
liam-h
Made a new thread, and realise now I should have just asked here...
Anyone have any insight on what a 10speed GRX shifter will be compatible with from the MTB range of cassettes/shifters?
Am I right in thinking that the cable pull of the GRX 10 speed is the same as 11 speed MTB, and therefore I could remove a sprocket from an 11spd cassette, and use an 11spd XT or SLX rear derailleur? Or am I talking nonsense?