• What do you use the bike for and for how long ?
    pretty much impossible for anybody to say what you should do without seeing you on the bike and how your current position is set up.1st off is your frame straight ? back & neck pain doesnt always come from frame size.
    A shallower seat angle and longer top tube is where I would look to make it more comfy if everything else is set up ok
    But I stress nobody can advise properly without seeing you on it ,including new fangled calculators and email an expert websites

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