Tire noise

[suprabahamut]

I wanted to make sure before I drive a lot, I have searched also but found nothing. I use to have 225/55/16 tires on and I bought some used tires for the time being until I buy new parts for the front end alignment, they are 205/55/16. After I bought the tires it sounds like growling a loud noise constant, and kind of thumping when braking. I think it is my suspension because it is old and creaks a lot before the used tires, or alignment problems because it wore my other tires out. They look fine no plugs and are not old, but maybe out of balance. The guy told me there is some new guys working there. I just wanted to know what you guys think? Is it something I should be worried about, or just leave it for now. After I buy new front end parts I am going to buy better tires so it is just temporary.