• I've had this problem before, basically the bottom of the stem has probably rusted itself to the steerer tube, the way i resolved it was to turn the bike upside down remove the front wheel and spray in a shit load of something like wd40 in the bottom of the fork. leave it to work for a while then replace the front wheel,

    make sure the expander bolt is gone and then brace the wheel between your knees, grip the bars and try and twist them back and forth, after a while and some sweat and elbow grease you should be able to twist the bars round, now just keep going until you can slowly move the bars up.

    if it doesnt work for a while give up and spply more oil and then try again a bit later.

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