Headset loose? Hold the forks in one hand, handlebar stem in the other and wiggle, if you can feel there is play in the headset then that is the answer. Tighten it or you will pemanently damage the ball-bearing races.
@Zippie started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Headset loose? Hold the forks in one hand, handlebar stem in the other and wiggle, if you can feel there is play in the headset then that is the answer. Tighten it or you will pemanently damage the ball-bearing races.