What is the maximum size of tire i can put on a X 2005 without modification on 16'' wheel and on 15'' wheel ? What is the bolt patern ?

Thanks guys....

Bolt pattern is 6 on 4.5 (vs. the 2000-2004 6 on 5.5).
Wheel size is irrelevant as far as largest tire, it's just the size of the hole in the middle.
You can get a 33" tire in there with minor rubbing: Someone upgraded to the 285/75R16 32.83" diameter tire and I rub just a little bit up front while turning.

Bolt pattern is 6 on 4.5 (vs. the 2000-2004 6 on 5.5).
Wheel size is irrelevant as far as largest tire, it's just the size of the hole in the middle.
You can get a 33" tire in there with minor rubbing: Someone upgraded to the 285/75R16 32.83" diameter tire and I rub just a little bit up front while turning.

Thank you guy. I have another problem, I can't fin rim that fit on my 2005 X OR. I even ask the question to people at Nissan and they can't help me. Did someone now a company who make rim (not mag) for the 2005 X ?

Rim size: 16x7
Bolt pattern: 6x4.5
Offset: +30mm

I had the same problem, spent hours and hours searching. No one is making any aftermarket wheel for 05-06 Xterra. Stock steel wheel for winter from Nissan is way expensive. Very disappointed so far in looking.