Originally Posted by
cat0020
Not sure, 10 spd spacing is pretty much universal.
It may be that cable pull ratio on the derailleur is different from Shimano, Campy or SRAM.
not quite. Shimano and SRAM have the same cassette spacing (3.95mm) but Campagnolo is different enough (4.12mm) that rear shifting doesn’t work quite right if using a Shimano/ SRAM cassette on Campy derailleurs, or Campagnolo cassette on Shimano/Sram derailleurs…
11 and 12 speed are close enough that they are cross compatible