So got my 20" snowflake wheels, conti extreme contact new tires, Leman special edition flares and running boards.

Question is should I add spacers to my rear and/or front. I read so many stories that they brake or make crazy behavior and people ended up taking them out.

I live in pothole country bay area CA, so I'm wondering if that it is a good idea. If yes, which ones and how many millimeters?

Thanks