maybe the 19 year old $7 an hour kid checked to make sure it could do wheelies on the post-setup ride check and jacked up your head bearings? because my 30k mile well abused racebike has original oem bearings and has virtually no stem/head play, along with no wobble when the tires are balanced. it did wobble from the factory with stocker IRC tires and only stopped wobbling after i changed the tire and balanced it myself.
maybe the wheels/tires come unbalanced from the factory
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