Hi..
I have a few questions in this topic. And really need some help. Thank you for any comment and suggestions.
My car is mazda3 GX, 05 model.
The car is currently having the 17" stocks and Kumho tires.

It's really making some noise while driving, and while at 60-90km/h, i could feel the vibration from my feet. While the car is on Parking, I could hardly hear any of this noise. So I am guessing its the tires. Please correct me if I am wrong.

Also, last time having my oil changed, the mechanic told me that the inner side of all 4 tires are more worn out than all other parts on the tires, and suggested it could be the alignment. I've done some research, and this inner-side-more-worn out is a pretty common problem. Could anyone please suggest what I should do about this?

And lastly, I am looking to put some 18" wheels onto my mazda 3 GX, 05 model. I know that the bolt pattern is 5x114.3. Any 18" wheels would be good? i am thinking of 18"x7.5" or 18"x8". I heard about some rubbing. Please advise me here.

Thank you everyone for reading this. Any comment, suggestion will be greatly appreciated.

 

In terms of noise and wear on tires........you are either running with the wrong tire pressure constantly or you need an alignment, or both! If they are already worn, then you aren't going to solve the issue without getting new tires. If/when you do, get it aligned and check your tire pressure once a week, at each fill-up, or when you check your oil.........which should be once a week or just about every fill-up.
Not sure about the 18", you'd have to search. The 3 is not my car but my daughters and we haven't had it that long, so I don't really know.

 

You can find the tire bolt pattern on 1010tires - Bolt Pattern: 5/114.3 for an 07 M3GT. the alignment is definitely the problem, on mine the front and rear camber is off more than i'd think was normal - but it's to spec I assume. The rears wear more on the inside than they should - just find a good alignment guy and have at it... or be bold and try doing it at home