Thumping noise - can't figure it out

Inertia said

Delaminated or fractured tire.
Put the spare tire on the one you hit, and/or the one that's noisy.

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Odd. I put the spare on today. Replaced the wheel that hit the curb a couple times. The thumping is still there. I guess I could change out the other three tires. That would eliminate a tire problem. The sound is hard to isolate.