02-17-2008, 02:07 AM
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CC Member
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Join Date: May 2006
Location: Perth,
WA
Cobra Make, Engine: G-Force, 5.0L Tickford LPG
Posts: 58
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Not Ranked
Calculating Wheel Offset
Anyone know the proper way to calculate wheel offset before I order any wheels?
I have the tyre widths, distance between where I want the outside of tyres to be, and distance between hub faces. Body is not on the car.
I assume the calcualtion would be
(tyre width / 2) - ((distance between outside of tyres - hub to hub distance)/2)
In the case for my rear wheels it would be (this is approx)
(315 / 2) - ((1680-1400)/2) = 17.5mm offset.
This in effect is the distance between where the wheel/tyre centre would be to where the hub face is.
Tyres haven't arrived yet so I will be meauring these once I get them. I would guess 315's may be slightly different when actually measured. Is this the case?
Have I got this calcualtion right?
Cheers,
Auscobra
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