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@gbj_tester
I use 72" on my Pompetamine, but that's very road biased. 66" is the classic winter gear. 63XC didn't choose their domain name at random. You'll just have to experiment for yourself, which is one of the reasons why I was suggesting an expensive cassette hub rather than a cheap screw on hub. You may well find you go through all the sprockets from 17 to 21 before finding out which one suits you best.