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On 24 Oct 2003 at 19:02, Aaron Clow wrote: > The 15x5.5 4-lug OE-style wheels have a 4-1/4 inch > "backspacing" according to CIP1, while the 15x4.5 > 4-lug OE-style wheels have a 4-1/2 inch "backspacing." Were these 2 backspacings meant to be the same? > Is backspacing the same as offset, and would these > values make them a proper fit for a Squareback? They are different. Offset is measured from the midplane of the tire. Backspacing is measured from the inner bead seat. If you know the width and backspacing you can calculate the offset. If you know the width and offset you can calculate the backspacing. Personally, I think the offset is the more useful number. In the examples above, the 4.5" rim has a 2.25" offset and the 5.5" rim has a 1.75" offset. The OE type 3 offset is 46mm = 1.81", which is pretty close to 1.75" -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org