That dent does not seem too bad. If it does not affect the steering tube, it could be safe to ride? Not sure you would need to replace it? You may be able to have the dent pushed back out?
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My bikes: 1970`s Roberts - 1981 Miyata 912 - 1980`s Ocshner (Chrome) - 1987 Schwinn Circuit - 1987 Schwinn Prologue - 1992 Schwinn Crosspoint - 1999 Schwinn Circuit - 2014 Cannondale Super Six EVO