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Old 11-09-2004, 14:52   #1 (permalink)
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stud pattern/offset

what is the stud pattern / offset for a 1990 gl falcon. im lookn into gettn som rims. thanx
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Old 11-09-2004, 15:09   #2 (permalink)
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Re: stud pattern/offset

offset = 0 (zero)[or as close as possible]
PDC= 5 x 114.3
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Old 11-09-2004, 16:39   #3 (permalink)
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Re: stud pattern/offset

That's PCD (Pitch Circle Diameter) and is the same as 5 x 4.5"

Offset is zero if wheels are stock width, it'll be different of they are wider which I'm guessing they would be!
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Old 11-09-2004, 16:51   #4 (permalink)
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Re: stud pattern/offset

PCD i always type that wrong

So if you have 7" rims with zero offset, that means 3.5" inches either side of the centre of the rim, now assuming that 3.5" is the inside measuremnt allowable, and you goto 8" wide rims, then the offset would be 1" , now is that a positive or negative offset or how is it stated when shopping for rims ??
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Old 11-09-2004, 17:29   #5 (permalink)
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Re: stud pattern/offset

Quote:
Originally Posted by Dellboy999

So if you have 7" rims with zero offset, that means 3.5" inches either side of the centre of the rim
Yep, with you so far

Quote:
.... now assuming that 3.5" is the inside measurement allowable
OK

Quote:
.... and you goto 8" wide rims, then the offset would be 1"
Nope. It'd be 1/2" measured from the wheel centreline (4") to the mounting face (3.5")

Quote:
.... now is that a positive or negative offset or how is it stated when shopping for rims ??
Negative as the mounting face is inboard of the wheel centreline.

Though if you have followed this you'll probably know more than the guy at the tyre shop and just end up confusing them.

See here; http://www.tirerack.com/wheels/tech/offset.htm
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Old 11-09-2004, 17:39   #6 (permalink)
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Re: stud pattern/offset

OK so to go wider (and stay within insurance limits) you would be looking at 8" wide rims with a PCD of 5x114.3mm or 5x4.5" and a negative offset of around 10mm or so.
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Old 11-09-2004, 19:17   #7 (permalink)
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Re: stud pattern/offset

Quote:
Originally Posted by Dellboy999
OK so to go wider (and stay within insurance limits) you would be looking at 8" wide rims with a PCD of 5x114.3mm or 5x4.5" and a negative offset of around 10mm or so.
Only if this is correct;
Quote:
...if you have 7" rims with zero offset...
I didn't think stockies were 7" but you've got the right idea.

Happy shopping :)
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Old 11-10-2004, 02:14   #8 (permalink)
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Re: stud pattern/offset

Could this thread be made a sticky, or added to the other FAQ thread? This question comes up every month or so.
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Old 11-10-2004, 02:20   #9 (permalink)
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Re: stud pattern/offset

i've got some 17" CSA edge mags that i took off my ea gl just sitting in the shed if ur interested
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