Originally Posted by
Troul
if it were an eight speed cassette, I'd paint a different picture with my thoughts.
9+ cassette with 11 speed crank, i expect that it'll be ok. I haven't put raw numbers together to establish a professional data sheet, but even then a real world test can reveal different outcomes that calculated data might not factor.
I'd look on sheldon brown. The site has all the "official" data, but also tons of macgyver options, such as how to put 8 on a 7 speed freehub by using thinner 9 speed cogs, spacers and chain (IIRC), etc, and many more scenarios; I think if it can be done, they have details if it works and how to do it.