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Hey, nice bike!
Does it physically wobble at 40mph? Like you can see its surface or edges is uneven? Or is it a shaking that you feel? No shaking or wobble @ less than 40mph? Alignment and out-of-round issues would also show up at all speeds. Does it go straight and not pull to one side or lean?
It probably just needs balancing, I don't see any weights on wheel.
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