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Perfect 9 spd cassetteI love this cassette! This is probably my 3rd one in this configuration over the years (11-34t). I've put over 2k miles on one with little wear. The 11-34t isn't a lightweight but the M770 XT is lighter than a lot of them out there. I've usually ran this with X9 shifters, X9 or X7 dearilleur and a KMC chain or PC971 chain with great results.