2004 Pontiac Grand prix rough ride?

I just bought new tires for my 04 pontiac Gr Prix. But i can feel a lot of roughness when i drive it, you can feel the texture of the road even on a new paved and smooth road. Its harsh. The steering wheel dosent vibrate but you can feel is not a smooth ride. It was not like that before.

Just wondering is something wrong with the tires? maybe i got a bad tire, or underinflated. Right now is at 30psi, the recommended pressure.
 
it's just the new tires, they probably just have a thicker tread than your used to, i just got new tires on my truck that are supposed to be a mix between offroad and street ties that will last a long time. even the tinyest bump feels like i hit a deer.
 
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