Two banging sounds with each rotation
Most beach cruisers have a chain guard. There is always a slight "wobble" of the front chain ring, check to make sure the chain isn't slapping the chain guard. The chain guard can be adjusted. The chain also might have loose tension causing it to bounce around just enough to hit the chain guard. The opposite may be true, if the chain is too tight, you could be getting a popping sound at certain points on the chain as it messes with the gear teeth, in this case loosen the chain slightly to put a little slack in it.
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