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Two things could cause the tire to make a noise sounding like a flat tire even though the tire is fully inflated. First, if the tire has a big enough flat spot on the tread surface and second if the radial plies in the tire have separated letting air between the belts causing patches of the tread surface to bulge.

Answeri test drove a geo that had loose lug nits on it that made a noise like that
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14y ago

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