I have a 9sp setup I’m very committed to, mostly because I can’t find 10/11sp indexed downtube shifters (Dia Compe makes a non-indexed 11sp and that seems to be it). I want a new crank with swappable chainrings to support a 2x9 touring setup and a 1x9 city setup.
I assume the 10/11sp chainrings have different tooth thicknesses than 9sp chainrings. Please confirm that. I’ve also seen the cranks themselves specified as 10/11sp and I’m wondering if maybe the chainring positions are spaced differently than they would be on a 9sp crank. This is my main concern as it’s hard to find cranks specified for 9sp.