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Discussion Starter #1
I just ordered a set of 17x9" rims for my 2000 psd and they have a 6" offset? I will be adding a 4" lift and 35's. Is this too much offset? Wuill the tires stick far out?
 

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you only need about 4-4 1/2 inches backspacing, they're probably gonna stick out quite a bit.
 

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Discussion Starter #3
That sucks.
 

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Backspace and offset are totally different.

Besides, the larger the backspace number, the Narrower the truck will be, not wider.

Get the value for the backspacing as that is a standard and you don't have to try and figure out what the hell their definition of offset is.

And for any trackwidth, the backspace of the wheel would have to be different if you changed the width of the wheel if you wanted to maintain the same trackwidth. So you can't just say x backspace looks the best unless you also include on x wide of a wheel.

On a 10" wide wheel 4 5/8" backspace looks very nice IMO.

So to equal the same trackwidth with a 9" wide wheel would require a backspace of 4 1/8" not 4 5/8".

You can't just say x backspace looks good when different wheel widths effect the trackwidth of the truck even if the backspace stays constant.
 

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Discussion Starter #5
So if the offset is 6", will it fit right on a 9" wide rim?
 

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6" backspace will sit under the truck and you will rub on the leaf springs
As mentioned, on a 99-04 truck you will want approx 4.5" of backspacing (regardless of the width of the wheel).


6" Backspace is something like you would put on a lowered truck or maybe a 05-08 SD.


Offset is generally listed in mm and is positive or negative...it refers to the distance of the wheel mounting surface from the true center of the wheel.
 

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Some people might undercut the relevance of the wheel width to the question of what backspace to go with for the sake of simplicity, like it just doesn't matter... and a 4.5" backspace just looks good on a superduty no matter the wheel width.

:rolleyes:


If you ran an 8" wide wheel with 4.5" backspace the wheel would tuck up under the fender and totally neuder the truck's looks, not to mention try it's best to put a decent tire into the leafspring. A lot of the bigger wheels run narrower sizes, and 8" is nothing crazy.

Now on the other end of the normal wheel widths run on these trucks is a 12" wide wheel. Now a 4.5" backspace on a 12" wide wheel would put the trackwidth way to wide and make the truck look retarded for the opposite reason. Look like a fiesta ride with 14" (tall) wheels sticking completely out from under the fenders.


But even dumber than that is the fact that with the 8" wheel on the truck, the centerline of the wheel is actually a half inch Inside the mounting flange (the rotor face). And with the 12 " wheel the actual centerline of the wheel is one and a half inches Outside the mounting surface on the truck.

Meaning that between the two wheels options with the exact same backspace, the trackwidth of the truck changed Three inches just by changing wheel width.

If 3 inches is close enough you'd best leave design to someone else because a trackwidth change of a half and inch is VERY dramatic to a truck. A change of 3 inches is ridiculous. It totally changes the way the truck looks, and functions if we even want to go there. How about the 8" wheel putting the inside of the tire into the springs, and the 12" wheel putting the tire into the fender and bumper because of the arc created by having the tire centerline one and a half inches outside the hub.

You don't just Put a 4.5" backspace wheel on a superduty unless you just don't give a damn how your truck looks or functions.

Wheel width has got to be known. Why do they even offer all the other backspacings for 8 on 170 wheels? Must be all the other trucks that need those different spacings, lol. That or the fact that most people actually care about the way their truck turns out.

:postwhore2:
 

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not to burst your bubble but most aftermarket wheels that are 9 inches wide carry a 4.5" backspace. even an 8' wide wheel with a 4.5" backspace will sit further out than the stock wheel. an 8'' wheel with a 285 tire will not rub. if ya want something bigger you should go to a wider wheel anyway.
 

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You don't just Put a 4.5" backspace wheel on a superduty unless you just don't give a damn how your truck looks or functions.
:postwhore2:
99% of aftermarket wheels for the superdutys come with a 4.5" or 5" backspace
 

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And what's the width on 99% of those wheels?

Put the same Backspace on a 12" wide wheel if want to look like an idiot.

Hey, if you just don't really care what the truck looks like, cool. If you do, you might want to GOS about the backspace more than the guy that cast the wheel did. There are wheel manufacturers that simply don't offer a decent offset for a superduty wheel.

Basically, a half an inch is the difference between, DAMN, that was a sharp looking truck, and yeah ....it looks good and all...... do you know why the tires stick out like that???

I've learned that most people are to stupid to know what they're doing anyway, and usually don't even pick the wheels because it just doesn't matter to them. They just want some big ole tyrees on theere truk.

They're not the ones I was worried about.
 

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i think it just depends on what truck your puttinh it on. a 12" wide wheel will not fit on a stock or semi lifted truck. however if you want to say run 44's youlll need a 12" wheel with a 4.5 offset inorder to keep the tires out of the springs.

panteramatt- the wheels you orderd are more than likely for a 05 and newer truck. with a 17x9 you need a 4.5-5" backspace(around a -12mm offset). your tires are going to rub bad with that high of an offset.
 

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Discussion Starter #12
Im trying to find out what the backspacing is on them. I will let you all know as soon as I get ahold of him.
 

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And what's the width on 99% of those wheels?

Put the same Backspace on a 12" wide wheel if want to look like an idiot.

Hey, if you just don't really care what the truck looks like, cool. If you do, you might want to GOS about the backspace more than the guy that cast the wheel did. There are wheel manufacturers that simply don't offer a decent offset for a superduty wheel.

Basically, a half an inch is the difference between, DAMN, that was a sharp looking truck, and yeah ....it looks good and all...... do you know why the tires stick out like that???

I've learned that most people are to stupid to know what they're doing anyway, and usually don't even pick the wheels because it just doesn't matter to them. They just want some big ole tyrees on theere truk.

They're not the ones I was worried about.
Okay, so what backspace would YOU run on a 20x12 wheel with a 40/15.50R20 tire on a 99-04 SD?

Yes, 4.5" BS will have that tire sticking out a good bit......but increase the BackSpace and you will be rubbing on the leaf springs when you turn.




And granted I wouldn't run the same BackSpace on a 05-08 4x4 SD truck either. I run 20x10s with a 4.5" BS on my 2001 and 18x8.5s with 5.14" BS on my 07.
 

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You threw another variable in there, being tire height. Wheel width and tire height are not a fixed proportion. Tall and skinny or short and fat.

So to re-introduce perspective, why don't you put your big tire on a 9 inch wide wheel with the 4.5" backspace and tell me about rubbing the springs again.

My point exactly. No one backspace is the backspace to run on any particular truck independent of all else.

The backspace has to match everything else. Wheel width is the determinant of trackwidth when paired with the backspace. But if you now want to talk about huge tires vs small tires, you just gave another reason for needing to vary the backspace I wasn't even going to bring up.


You just can't say on a 99 - 04 truck X backspace always looks good. That's all I was saying. I think we both agree, we just got off on the wrong foot there.
 

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You could put a wide tire on a skinny wheel with 3.25" of Backspace, and increase the wear and tire on front end components (i.e. unit bearings, ball joints, TREs, etc..). I run 15.50" wide tire on 10" wide wheels with 4.5" backspace to keep the tires from sticking way out, not create a huge strain on the front axle components and have modified my steering stops to prevent any tire rub.

Running the right size tire on the wheel (i.e. running a manufacturer suggested wheel width with the specific tire) and ~4.5" is pretty much always going to be the backspace to run on a 99-04 4x4 SD.



But I do see what you are saying that 4.5" backspacing may not always be the perfect setup depending on wheel with and tire size and if you don't want any rubbing at all...
 

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There is an enourmous range in tire height all specified for use on a 10" wide wheel. I just don't think that every tire in that entire range is best suited for the exact same wheel backspacing. A taller tire would be suited for a truck with more lift. The taller truck would do better with a wider stance, less backspace than the same wheel width, but a shorter tire, and lower truck would.

A less conceptual, and more practical example would be the fact that my 99 with a 6" lift would have put the tires directly into the fenders when I was running 37" Toyos on 10" wide welds if not for the 4 5/8" backspace I ran. The 4.5" backspace would have left the tires too wide and they would have hit the backs of the front fenders bending them nicely pulling in the driveway I'm sure.

Something else, is that this guy is running a 9" wide wheel. He needs less backspace than either of us.


There's a perfect example of all of this in the current Diesel Power. There's a Ford and a Chevy both in an advertisement for a pre-runner style bumper. They are both running the exact same tire size and same wheel width but the ford looks nice, whereas the Chevy looks like complete crap because it's totally neudered with too much backspace.

I think you would be best to take a look at where you want the tire to sit on the truck and choose the backspace that gives you that, not just pick 4.5 with a blindfold on no matter what.

That's just me though. If 4.5 always works for everyone else, more power.
 

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But, even on a lifted truck (9-10" lift) with 40/13.50R17 MTRs on 17x10s is going to run 4.5 (new welds) or 4.625 backspace (old welds).

4" lift with 35/12.50R18s on 18x10 is going to run the same.


Yeah, if the owner wants a wide stance the 3.25-3.625" backspace wheels are the way to go assuming they have the additional height to clear them....but not the best setup for the truck.

5" Backspace or some with the 5.71" have a much greater chance of putting the tires into the springs on a 99-04 by keeping them further under the truck.
 

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True, but mine would have put the tires into the fenders with the 4.5" bs.

Whereas with the 4.625" bs they did not hit, but came oh so close, and hitting the springs was never a concern anyway. Even with the increased bs.

I just didn't think it was a one size fits all deal. If it is, then I appologize for the derailment.
 

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Bringing up the past.

so charles.(or anyone else who wants to respond.) would you reccomend a 16x9 4.53" backspacing, and -12 offset for an 01 with 4.5" all spring lift and 35" toyo's?????
 
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