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Out of round, or off center. Get the front wheel off the ground, mount a pencil or other small stick like object to the fork with wire or zip ties so it doesn't move, and put it somewhat close to the outer edge of the rim. If the edge of the rim moves up and down from that point, and/or side to side aka away and near to it, then your wheel is out of true and that needs to be taken care of.
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