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The 20" wheels and tires must be involved in some way because no i3's with 19" wheels and tires are afflicted. I suppose there might be some sort of harmonic resonance triggered by the 20" wheels and tires but not by 19" wheels and tires. One fix that BMW seems loath to offer is replacing the 20" with 19" wheels and tires with the appropriate credit being given to the customer. If a customer refused that solution, then the customer should have to live with the sound.
