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Discussion Starter #1
Looking back at a thread from August, I found the following information on backspacing:

RogueClimber said:
The X needs these: 16X8 6-114.3 or at least the 6 lugs on 114.3 spacing...
And this:

USMC XTERRA said:
The numbers off the box are as follows.
#80/(AH23427)
CODE 62485
SIZE 16 X 8
OFF:12AM/71.5
PCD:6-4.5(114.3)
VENDOR NUMBER 13220

MB Motoring wheel-
PREDATOR
ANTHRACITE
MACHINE
I'm thinking about getting these rims from American Racing at some point (for some reason I can't embed this into a URL hyperlink). http://www.americanracing.com/wheel...e=3985&desc=1-piece painted alloy&section=ORT

Which Part # would fit the X?
 

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doesn't look like they have a 6 on 4.5 wheel on there...

and it's more than that..because of the weird makeup of the front brakes, it won't necessarily fit, even with the all the correct numbers.
 

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I have tried two different model AR wheels and neither fit. All the specs were right except the calipers hit. The hub face wasn't high enough.
 

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lj1983 said:
doesn't look like they have a 6 on 4.5 wheel on there...
I apologize for the stupid question, but does that mean a 6-bolt pattern with 4.5 backspacing? I thought I saw a few part #'s with those measurements.

Backspacing has been explained to me before, but I still get confused. The two columns I don't understand on the page I linked above are the "Offset" and "Backside" columns. Is there a formula that uses both #'s to get the final backspacing?

Now that I look at the page again, I guess I don't quite understand the "Bolt Circle" column either. I thought it was for bolt pattern, as in how many lugs you have on the wheel, but I'm second-guessing myself now.
 

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you have 6 bolts on the wheel...arranged in a circular pattern with i believe a diameter of 4.5" (114 mm?) the older Xs, because of their hubs, had a 5.5" diameter pattern. (older dodge dakotas have the same bolt pattern as we do)

AR has a good FAQ about Backspacing on there...it doesn't have anything to do with the the wheel pattern, but how far "in" the bulk of the wheel is compared to the face of the wheel(where it mounts to the vehicle)...

eh..that's not right, there was a picture somewhere around here that explained it well i'll try and dig it up.
 

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your explanation does look right.

More backspace = more tire in fnderwell.
Less = more tire sticks out.
It's a pretty important spec as it can toatlly affect the safety and handling. Not to mention eating a tire up on suspension parts.

MC
 

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Discussion Starter #7
lj1983 said:
you have 6 bolts on the wheel...arranged in a circular pattern with i believe a diameter of 4.5" (114 mm?) the older Xs, because of their hubs, had a 5.5" diameter pattern. (older dodge dakotas have the same bolt pattern as we do)

AR has a good FAQ about Backspacing on there...it doesn't have anything to do with the the wheel pattern, but how far "in" the bulk of the wheel is compared to the face of the wheel(where it mounts to the vehicle)...

eh..that's not right, there was a picture somewhere around here that explained it well i'll try and dig it up.
Damn. Those would have fit perfect on my old '02 then.

The American Racing Tech Center has some cool links and calculators.

After determining the centerline, measure from the mounting pad to the edge of the inboard flange (if the wheel were laying flat on the ground – face up – your measurement would be from the ground to the mounting pad). This is your back spacing.
What is the mounting pad? Once I know this, then I think I'll understand backspacing. And what is the offset on our trucks?
 

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Discussion Starter #8
Bump.

On American Racing's site, they list the following columns: "Part No.", "Size", "Offset", "Backside", "Bolt Circle", and "Note". Just so that I have all of the correct measurements, am I correct in saying that this is what the '05+ stock X rims are?

Size: 16x7
Offset: -12
Backside: ??
Bolt Circle: 6 x 4.5

When looking for new rims, aside from the "Size", should I be concerned with Offset, Backside and Bolt Circle? Or just Bolt Circle?
 
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