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Although tire vibration can be maddening, the reasons are usually fairly straightforward. If the only change prior to the symptoms was addition of new go flat tires, then the range of possible root causes is smaller. Few suggestions:
- The wheels may not be properly torqued. If the shop used an impact wrench, never visit this shop again. The lug nuts must be torqued with a torque wrench
- The tires could be defective. It's rare yet it happens. Where are the vibrations coming from: front axle or rear axle? Tires should have been inspected for uneven tread placement or signs of even slightest cupping
- The wheels may have micro cracks. Centrifugal forces expand the crack and change the geometry of the wheel. Since the symptoms appear at high speeds, it's a possibility
The above steps do not even have to be mentioned to a competent shop.
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