I need help figuring out wheel & tire fitment

dra2120

Active member
Hi all,

I need some help figuring out what I need for proper fitment of my next set of wheels and tires. The vehicle is a 2010 Infiniti QX56. It came from the factory with 275/60R20, and big heavy chrome 20x8" wheels (that I have been unable to find definite specs on). I'm planning on doing a 2" lift to the truck. I'd like to bring the wheel size down to an 18", and bring the tire size up to a 37". I don't know if I can actually fit 37s, as they would work out to 2" bigger on all sides than the factory 33s, and I only have about 2" of clearance from the factory rubber to the fender. The lift might give the clearance I need, but it would be tight...Too tight, I don't know?...If not I can definitely fit 35s.

I've spent a lot of time with online tire calculators, trying to figure what will actually work, and what sizes I need, but I'm getting myself more confused than anything. Below are what I'm looking at, but I'm open to suggestions, because again as I've said, I'm getting myself confused more than anything. I can take measurements of anything on the truck that people need. Any help is appreciated.

I've been looking at these wheels: https://www.methodracewheels.com/products/mr305-nv-bronze
and these tires: 37" https://generaltire.com/tires/light-trucksuv/grabber-x3 in a 37x12.5R18
or these tires: 35" https://generaltire.com/tires/light-trucksuv/grabber-atx in a 35x12.5R18
(I would prefer narrower tires than a 12.5, but haven't been able to find any.)
 

billiebob

Well-known member
Find the factory wheel size first, Back space or offset is the most important starting point.
 

dra2120

Active member
From what I can find on different forums and such is that the stock offset is 25mm. I've seen a few sites say that the backspace was 5.5, but that is for a different trim with 17" or 18" wheels...I would think though it would still be the same, with the 20" wheel though.
 

NatersXJ6

Explorer
Some factory wheels have the size and offset or backspace cast into the inside of them. Have you pulled a wheel to check? Or... check a factory parts catalog at a dealership or dealer website, sometimes the offset or backspace is in the part description.
 

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