I recently installed 19" wheels on my z with so-3 tires in front and pilot A/S in the rear. I don't feel any vibration on my car but I hear very loud noise coming from the tires? or wheels? Is it because I'm using different kind of tires or is it because of wheel problem (offset/unbalanced)?
Thank you.

 

why are you using 2 sets of tires ?

you should have all 4 tires the same.

 

I average 2-3 sets of rear tires for every 1 set of fronts, and Ive run different tires front and back without noise issues. Can you explain a little better what the noise is like ? Are the tires worn down the same? Are you sure its the tires ?

 

I'm using different set because I the front tires came with the wheels when I bought 'em and has about 60% thread left and the rear tires are brand new. The reason why I have different sets of tires is because it rains a lot here in vancouver so if the front tires wear out I was planning on getting pilot for the fronts then.
How should I describe the sound... hm... It sounds like I'm on like a huge container truck. The sound is very loud when I slow down from high speed to 30~40 mph. My friend's rsx makes same sound when he has same set of advans on his car. He said the sound comes from the tires bacause his advans have very little thread (performance tires).
I hope this is a better description?