Nominal Offset - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 10-01-2012, 09:21 PM Thread Starter
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Nominal Offset

While looking through the 2011 f350 specs I came across the wheels and tire section. And I had a few questions. Correct me if I am wrong.

Both the 18" and 20" wheels are 8" wide.

And the nominal inset (+ offset) is 40.

My biggest question is about the nominal Inset, Is this what the wheels actually are? Or what they should be to have the wheel centered over the hub?

I am confused becuase I read a thread on this site that said the 18" wheels are 8" wide and have a +40 offset. While the 20" wheels are 10" wide and have a +19 offset.

Thanks

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post #2 of 5 Old 10-02-2012, 12:36 PM
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The 20" OEM wheels are also just 8" wide. They are not 10" wide
The 2005 and later wheels have a greater offset than the 1999-2004 trucks. As Ford widened the axles in 2005 requiring the larger offset.

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post #3 of 5 Old 10-02-2012, 10:02 PM Thread Starter
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Anyone know?

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Nitto Terra Grappler 295/70/R18 on OEM's
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post #4 of 5 Old 10-03-2012, 04:07 PM
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to big Laing in order to understand wheel offset, you need to start with the basics ..if a rim like ford is 8" wide..and says plus 40, this means it has a 40 mm positive offset..essentially, if you had a zero offset your rim contact point on the rotor would be at dead center (which would be a zero offset) with this being said , as you move that point of contact closer to the front of the rim,you have a positive offset..as you move that point of contact to the back of the rim you have a negative offset or an old school DEEP DISH rim,,,it is easier to google offsets so they have a picture to look at..hope I explained this in "simple terms"
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post #5 of 5 Old 10-03-2012, 05:11 PM Thread Starter
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Quote:
Originally Posted by tonydumpsters View Post
to big Laing in order to understand wheel offset, you need to start with the basics ..if a rim like ford is 8" wide..and says plus 40, this means it has a 40 mm positive offset..essentially, if you had a zero offset your rim contact point on the rotor would be at dead center (which would be a zero offset) with this being said , as you move that point of contact closer to the front of the rim,you have a positive offset..as you move that point of contact to the back of the rim you have a negative offset or an old school DEEP DISH rim,,,it is easier to google offsets so they have a picture to look at..hope I explained this in "simple terms"
Sorry I know your trying to help but that is not what I was asking. I know what an offset is. I know how that affects backspacing. I know how to figure exactly how one wheel differs from another wheel. I know that a + offset is actually called an inset.

What i don't know is my original question on this post. Are the stock SRW
F350 wheels (18x8 and 20x8) actually a 40 inset (+40 offset)? Or is that what the trucks optimal offset is?

2013 Lariat Eco-Boost F150 Super Crew 4x4 20K Miles. Max-Tow 3.73's, luxury package. Amp Steps, Raceline Raptor Wheels, Bak-Flip, and much more.


(Sold) 2011 Lariat 6.7 F350 CCLB SRW 4X4 60K MILES
Nitto Terra Grappler 295/70/R18 on OEM's
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