Some explain offset to me please - Ford Powerstroke Diesel Forum
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Old 03-24-2010, 08:47 PM
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Some explain offset to me please

So if i go with wheels with -12mm offset the wheels wont stick out the fender as much but if i go with postive they will. Want rims that stick out more since i got pocket fender flares.
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Old 03-24-2010, 09:15 PM
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What size wheels are you looking at?

I have 18x9.5 with a -24 offset. I have the OE style flares and they stick out just a little past what the flares cover. The Pocket flares stick out an additional 3/4in over the OE style so with my tires and wheels, it would be under the flares just barely.
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Old 03-24-2010, 09:46 PM
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On ur truck I would do a 20x10 -24. That would look really good.
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Old 03-24-2010, 09:51 PM
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Quote:
Originally Posted by tylerwitt34 View Post
So if i go with wheels with -12mm offset the wheels wont stick out the fender as much but if i go with postive they will. Want rims that stick out more since i got pocket fender flares.
Offset is really easy. Positive offset is mostly for FWD cars as the mounting of the rim is toward the outside of the car.

Negative offset is the deep-dish wheels that you see where the rim mounts well inside the wheel. Here is a pic that can easily explain it

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Old 03-26-2010, 08:30 AM
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This is from Discount Tire:


If you know the rim width and offset, you can calculate the backspacing. First add 1" to the rim width and divide that number by two to find the wheels center point. Then take the offset and convert it into inches (25.4mm = 1"). If the offset is postitive, add the converted number to the divded rim width (center of the whee). If the offset is negative, subtract it. Here's a couple of examples:

18x8 +25mm offset.

8+1 = 9/2 = 4.5"
25/25.4 = 0.98"

4.5" + 0.98" = 5.48" (5.5") back spacing.

18x8 -25mm offset

8+1 = 9/2 = 4.5"
25/25.4 = 0.98"

4.5" - 0.98" = 3.52" (3.5") backspacing.


Hope this helps,
Mark
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Old 03-26-2010, 09:33 AM
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so then what ur saying is to get a wheel to stick out u need a negative offset, im wondering the same thing im looking at a 16x10 with a -38 offset and want the wheel to stick out cause i have cutout fender flares
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Old 03-26-2010, 11:20 AM
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Behr, in a nutshell, yes.
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Old 03-26-2010, 11:25 AM
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i'm looking at KMC wheels, nothing on there site says anything about offset?
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Old 03-26-2010, 11:34 AM
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Quote:
Originally Posted by Clay Henry View Post
i'm looking at KMC wheels, nothing on there site says anything about offset?
May want to get a hold of them about the wheels your looking at. I just looked, they don't give a whole lot of information at all.
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Old 03-26-2010, 02:08 PM
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Go to WHEELPROS WEBSITE and click on each wheel. That will show the BS and OS.

Mark
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