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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 12-25-2012, 10:50 PM
npd23 npd23 is offline
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stock wheels on 1993 f150

i know that my wheels are 15x 7.5 with the 5x139 or 5x5.5 lug pattern but what is the stock back spacing?

thanks Nick
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Old 12-26-2012, 11:18 AM
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All stock Ford wheels have 0 offset which means the hub mounting surface is in the middle of the wheel, so the backspacing is just 1/2 of the total wheel width or 3.75" in your case.
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Old 02-07-2013, 01:12 AM
RadnyB999 RadnyB999 is offline
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Question Stock backspace, I'm still confused...

Quote:
Originally Posted by Conanski View Post
All stock Ford wheels have 0 offset which means the hub mounting surface is in the middle of the wheel, so the backspacing is just 1/2 of the total wheel width or 3.75" in your case.

Thanks for that information. But I'm still confused!
I have an offset coversion table from the back of a Wheel Pros catalog, that shows 7.5" rims at 0 offset, 4.25"

8.0" rims at 0 offset, 4.5"
10.0" 0 offset, 5.5"

These measurements all seem to be off by 1/2", or not match how you have just divided by 2.

According to this chart, 7.5" @ 3.75" is -12

I think, like many people, I want to buy aftermarket wheels, that match the factory offset. But these offset/backspace numbers seem like Greek to me!

If I am going to replace my 1990 Ford 15x8's, with aftermarket wheels and want them to fit like stock, what backspace/offset numbers should I be looking for?
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Old 02-07-2013, 01:03 PM
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The advertised wheel width is measured from the inside of the bead while the actual width is about 1" more, so a wheel that measures 7.5" outside would actually be considered a 6.5" wheel in the chart.
With these Ford trucks you don't want any more than stock backspacing or you start to get tire rub on the trailing arms and sway bar, so if you wanted to use an 8" aftermarket wheel you want it with -19 backspacing.

Click the image to open in full size.
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Old 02-07-2013, 08:35 PM
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I'm pretty sure the mag rims have abit of offset, say for example what was originally on my '94 F150, it had those hurricane steel mags, and I replaced those with regular steelies with dog dish hubcaps, and the wheels are completely inside the wheel wells instead of sticking out slightly like they did with the hurricane wheels.

Same tire size on both rims.
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Old 02-09-2013, 08:23 AM
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Smile I think I got it, thanks!

Quote:
Originally Posted by Conanski View Post
The advertised wheel width is measured from the inside of the bead while the actual width is about 1" more, so a wheel that measures 7.5" outside would actually be considered a 6.5" wheel in the chart.
With these Ford trucks you don't want any more than stock backspacing or you start to get tire rub on the trailing arms and sway bar, so if you wanted to use an 8" aftermarket wheel you want it with -19 backspacing.

Click the image to open in full size.
So in other words, my stock 15x8's, have an inner size of 7.5", so that offset would be 3.75"
Then on the chart 8" at 3.75" = -19

And depending on how different manufactures list, I'm looking for 8" with 3.75" offset or -19mm

And to change to a 10" wheel, 4,5" offset, or -25
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Old 02-09-2013, 08:23 AM
 
 
 
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