After changing from 17" runflats to new wheels with snow tires (16 inch Blizzaks) for the winter, it seems like my rear suspension is very noisy in a clunky way. It generally happens when going slowly over bumpy roads. it sounds like something is very loose in back. The car also feels like it is lower now.

Does any of this seem normal?

 

No. Take it to the dealer before the rear suspension falls off.

I have 17" Blizzaks and have had no problems with the rear suspension since putting them on.

 

Check your lug nuts man.