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as far as i see it, if you wanted to lengthen or shorten the rear end, you would do so at the expense of stretching or compressing the seat stays, thus changing geometry and weakening the frame. please correct me if i'm wrong or this has been covered but it seems to have very little advantage over an eno hub or cranks

Isn't it allowed because Ti can flex and always return to shape? Presumably only for minute adjustments...