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The tires are developing a flat spot from sitting overnight. The tire sits there in the cold and the rubber contacting the driveway becomes rigid. Some tires are worse than others when it comes to this. As the tire warms up the flat spot disappears as the rubber becomes more flexible, and the noise & vibration stops. Under-inflated tires are more susceptible to this. Keep your tires inflated to the factory recommended specs and that will help.

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11y ago
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Q: What would cause thumping noise like flat tire only during these cold mornings?
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