I have found tires to be high on the list when it comes to shimmy ... air pressure, remounting, checking true and dish. Doesn't matter if it's a computer or a bicycle... troubleshooting 101's first question is "what changed" In your case tires, wheel, and bars. Check the tension on the quil as well. I had one instance where when I first bought my bike the test bike was too small .. I rode it freehanded no problem then they raised the bars for my size.. after that I had a freehanded shiny.
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