Does anyone know what the stock speck are for the stock 18" wheel specs are on a 2010 FX4? I searched, and I searched, but cannot seem to find a firm answer. Width, backspace, offset please. I'm trying to use a fitment calculator, but need a firm base to work from. It's wheel upgrade time for me.

I wish the stock wheel specs were a sticky. I dunno what members here have access to that info, but it sure would help to save alot of confusion. This question has been beat to death. Not necessarily for a specific '10 FX4 wheel, but there is a whole lot of "what size are my wheels" questions over and over.

 

Stock specs for 18" 2004 to current is -

Width - 7.5"
BS - 5.5"
Bolt pattern - 6x135mm.

Same is true for the 17". 20" are wider and deeper BS.

 

Using this info, and a google search for backspace to offset conversion, http://www.galantvr4.org/docs/backspacing.htm I come up with +32mm offset. This number is lower than the general consensus of offset answers seem to be.

The same number is provided by http://www.mrw-wheels.com/wheel%20te...t%20chart.html

Anyone feel like shedding a little light on the equation? I kept hearing these stock wheels were a "high offset". Is +32mm considered high by market standards?

 

When I calculate it out, I get a BS of 44. Midline of the wheel is 3.75". Subtract 3.75 from 5.5 = 1.75". 1.75x 25.4 = 44.45 or an offset of 44mm. Assuming I am calculating correctly.

 

King, lets take it the other way around. If you cross reference the 32mm, it calculates into 1.25". Do you have any thoughts on where the other 1/2 inch is that we are missing here? Is there a piece of the formula that we are not seeing here?

 

Sorry, not sure, but looking at this, I calculated correctly.

http://www.tirerack.com/wheels/tech/...jsp?techid=101

 

Well king, Assuming that I go with an 18x9 wheel, could you give me a "how far from stock" measurement for a +30, a +10, and a -10 wheel.

I am giving some thought to a set of Series 7113 Metal Mulisha - Flat Black with Machining Alloy Wheel


These are an 18x9, 5 inch backspace, 0 offset. I thought i liked the Eagle 197 in superfinish, but I've seen pics on here of them mounted on f150's and they simply stick out too far for my liking. A little TOO redneck.

Truth is, I dunno what I want. I know that I want them to push out from stock. I'm running 5100's at max on my '10 FX4, and I'm looking for a decent look, without having to hack my truck. I'm locked to 18's, as I'm already running 295/70/18 trail grapplers



Any suggestions for an aggressive stance that won't rub in an 18" with the tires I already have?

You might be the king fish....... but I'm the one fishing now.

 

I would ignore the offset and make sure you get something with a similar BS as stock. Otherwise you could end up with problems. Those would stick out 1.5" more than stock. A 5" BS would be 2" more.
As far as tire size, you can't go much if any larger without needing a sizable lift or "hacking".

 

I'm absolutely NOT looking to change tire size. I plan to mount these tires on the new wheels, which is why I need to stick to a 18" wheel diameter.

You confused me with your response, you said those wheels would stick out 1.5 inches more, and a 5" would be 2", but these are a 5" BS.

Are you saying that a 18x9, with 5" of BS will stick out a full 2" further than stock? Would my math be correct then in assuming that an 18x9 wheel with 4" of BS would stick out 1" more, and ultimately an 18x9 with 3" of BS would sit the same as stock?

At what point does an 18x9 wheel backspace become an issue on the inboard side, and cause rubbing on the spring, and become "not mountable"?

 

No it is the other way around. a 4" BS would stick out 3" further. When I mentioned the 1.5", I meant an 18x9 with 5.5" of BS. The smaller the BS, the closer the mounting surface is to the inside of the wheel, and will stick out further. However, with a 17 or 18" wheel, I do not think you can fit anything with a larger than 5.5" BS, as it will start hitting the suspension components. The OE 20" wheel has a larger diameter so it can be tucked in further. Those wheels have a width of 8.5" and a BS of 6.5".

 

King, I have found a number of 18x9 wheels with a 5.7" B/S. You mentioned that anything larger than 5.5 would hit suspension components. Is 5.5 the limit, or would 5.7 still be an option?

Considering that you said 5.5 is the limit, in plain english, this kinda seems like a rhetorical question.... but it's an extra .2.

These are an 18x9, with a 5.7



These are 18X9 in a 5.7BS



These are 18x9, in either a 5.0 or 5.6 BS



These are 18x9, in a 5.8bs




These are several that I like, that are in that slightly above the 5.5 line that you drew. How firm do you truly think that line is?

 

Not sure what the limit is or even if there really is a limit. Best thing you could do is look at your existing wheels and see how close the components are to the wheel. Make sure you check both sides and in different positions, straight ahead, full left, and full right. Pain in the butt, but only way to make sure nothing will interfere.
I only mentioned the 20s as they are different and the reason may be the diameter would not interfere. Also thought I had read something about too much BS causing a problem.

 

I second kings response that the stock 18s are 7.5" wide and have an offset of +44. I also know they weigh 29.5 lbs if that is of any interest to you.