15x7 wheel with 4" back spacing (Translation???) - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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Old 08-20-2012, 08:39 PM   #1
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15x7 wheel with 4" back spacing (Translation???)

If a 15x7 Wheel has a 4" backspacing , what is the offset of it ?? How different from stock does that make it ?? How different from 10 Slot Stang wheels? will it work on the focus ?


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Old 08-20-2012, 10:35 PM   #2
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If my brain is working correctly tonight, zero offset on a 7" rim would be 3.5". That extra half inch of backspacing should then result in a 12.7mm offset (25.4mm = 1").

Last edited by Geezer; 08-21-2012 at 09:45 AM.
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Old 08-21-2012, 01:15 AM   #3
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Yeah, that sounds right, Geezer.

The wheels will "work" in the sense that they'll go on, but being that far out from the hub could have a negative effect on suspension load and tire rubbing when turning.
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Old 08-21-2012, 11:36 AM   #4
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well I currently run 15x8 10 slot wheels on a 185/60/15 not sure the offset, but it rubs occasionally Is this closer to stock?
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Old 08-21-2012, 11:39 AM   #5
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Without knowing the offset its pretty hard to tell.

But 15x8 is going to be a mustang wheel so I can speculate that no, its not really close to stock.
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Old 08-21-2012, 04:00 PM   #6
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The offset is usually embossed or engraved on the back side of the wheel (i.e. a spoke). The offset will be numerical and is sometimes preceeded by the letters "et". The stock Focus offset is close to 52mm. The most common offsets for aftermarket wheels (for the Focus) range between 40 to 49mm.
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Old 08-21-2012, 06:40 PM   #7
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So basically, we are talking like " messican lowrider stance"

heres how it sits now , except sitting higher in the rear now


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Old 08-21-2012, 07:50 PM   #8
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may help some people out
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Old 08-25-2012, 08:46 AM   #9
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Quote:
Originally Posted by 02Zetechse View Post


may help some people out
Good chart! I was just going to go there too.

If a 7" wheel has 4" backspacing then it would have a 0 ET.

Here is an article they may shed some more light on the subject.




The reason you get 4" backspacing on a 7" wide wheel with a 0 offset is because a wheel width is measured from bead seat to bead seat and backspacing goes all the way to the outer edge of the wheel.
That's why it's never just half of the wheel width with a 0 offset and that chart comes in very handy.
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Old 08-25-2012, 10:46 AM   #10
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Thanks Julian

I did a good bit of searching online before I found that chart and the entire atricle for that matter, it cleared up alot of confusion
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