having tried wide (2.35 nobby nics) with narrow rims (19mm SLX) & failed I thought I’d sort out some wider rims but am confused by Mavic – my xc317 & en321 rims both state the max tyre width is 2.3″

in the real world what is the max width tyre you can fit to a 21mm rim (internal) without getting roll at tubeless pressures (about 30psi for me)