Right now i'm running a rear 7 speed set up. HG70 cassette and chain, with STX components. And recently i just bought a XT mega 9 crank. The question is, has anyone successfully combined a 9speed crank and 7 speed rear successfully? If not, i think i'll have to upgrade the rest of the bike. Getting the crank soon, so i'll let you know if i'm successful.
What do you all think?