I worked on a friend's Klein Quantum Race here in SF to solve some of the same issues. He had a nice 8sp Shimano Tricolor that we both liked the looks of, but 11-26T and 39/53T was a bit much for the hills around town.
Added an 8sp HG51 11-30T cassette and 9sp silver RD-M591 long cage RD. Worked perfectly with his existing 8sp shifters. Should be the same with 9spd as the pull didn't change.
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