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18x9 5" backspace 0 offset?

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Old 02-06-2013, 11:27 PM
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Originally Posted by 2008f1504x4
No a 9" rim with 0mm off set is 5 back space a -12mm is 4.5
This is correct
Old 02-06-2013, 11:28 PM
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Originally Posted by 2008f1504x4
No a 9" rim with 0mm off set is 5 back space a -12mm is 4.5
No because a wheel with 0mm offset means the mounting face of the rim is dead center the width. So the measurement from the mounting face to the back side lip of the wheel would be 4.5 since 1/2 of 9" is 4.5".

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Last edited by BassAckwards; 02-07-2013 at 12:06 AM.
Old 02-06-2013, 11:29 PM
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Originally Posted by 2008f1504x4
No a 9" rim with 0mm off set is 5 back space a -12mm is 4.5
Holy crap i'm getting confused
Old 02-06-2013, 11:44 PM
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Originally Posted by MAX4utah

Holy crap i'm getting confused
If he were talking about a 10" wide wheel he would be correct.

I mean I actually sell these things for a living, but I'll let you make your own informed decision on who is correct based on the article and picture I have provided. Just don't want you to buy the wrong wheel! Good luck!

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

Read the * at bottom of article to see backspacing explained.

Last edited by BassAckwards; 02-06-2013 at 11:50 PM.
Old 02-07-2013, 12:19 AM
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This is how commonly backspacing and offset are messed up look at this calculator I found online!

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It says the backspace and Forwardspace are both 5". These measurements are always taken from the hub mounting face and maybe I'm bad at math but 5+5 does not equal 9 lol

Last edited by BassAckwards; 02-07-2013 at 12:33 AM.
Old 02-07-2013, 03:11 AM
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Heres 2 different charts for you that say the same thing.



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A little tough to read but both have a 9" wide wheel with a -12mm offset as a backspace of 4.5". A 5" backspace on a 9" wide wheel would be in fact 0mm offset.
Old 02-07-2013, 03:20 AM
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Originally Posted by 06F150CFCT
Heres 2 different charts for you that say the same thing.



Attachment 190710



Attachment 190711


A little tough to read but both have a 9" wide wheel with a -12mm offset as a backspace of 4.5". A 5" backspace on a 9" wide wheel would be in fact 0mm offset.
Hmmm I mean, I'm always willing to admit I'm wrong. But that would mean the lip for clamp on weights on one side would have to be an entire 1/2 wide on 1 side of the wheel, adding a whole inch to the wheels overall width. You could almost see this on an aluminum wheel due to the thickness of the metal, but what about those paper thin steel rims? and rims without clip on weight lips that only accept tape on?
Old 02-07-2013, 03:25 AM
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Originally Posted by BassAckwards

Hmmm I mean, I'm always willing to admit I'm wrong. But that would mean the lip for clamp on weights on one side would have to be an entire 1/2 wide on 1 side of the wheel, adding a whole inch to the wheels overall width. You could almost see this on an aluminum wheel due to the thickness of the metal, but what about those paper thin steel rims? and rims without clip on weight lips that only accept tape on?
haha yeah im not sure...These are just the charts I referenced when I purchased my 2 sets of wheels and it matches to what is stamped on the backside of my Moto Metal wheels now. I have 18x9 with a -12 stamped on one of the spokes.

I like your logic of thinking 0 offset is half the width which would be 4.5" but i guess it doesnt work like that completely.
Old 02-07-2013, 03:32 AM
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Originally Posted by 06F150CFCT
haha yeah im not sure...These are just the charts I referenced when I purchased my 2 sets of wheels and it matches to what is stamped on the backside of my Moto Metal wheels now. I have 18x9 with a -12 stamped on one of the spokes.

I like your logic of thinking 0 offset is half the width which would be 4.5" but i guess it doesnt work like that completely.
I mean that's what would make the most sense to me lol, makes it a lot easier to convert in your head. But I guess 2008F1504x4 and Golferguy667 were indeed correct. My mistake!
Old 02-07-2013, 06:54 AM
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Take this foe my example....
Wheel: 9" wide, 4.5" backspace -12mm offset
wheel: 9" wide, 5" backspace 0 offset

Does this wheel measure and fit the same?


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