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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
snottyotter
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.