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undecided,
the offset of the wheel is the distance from the ACTUAL mounting face of the wheel (where is touches the brake) to the IMAGINARY centreline of the wheel.
Backspacing is a different matter and pertains to the distance from the mounting face of the wheel to the backmost edge of the rim.
Aside from what Kaferchris said above, when you're trying to measure offset, whether you divide the ACTUAL width of the rim (measured by yourself) or the NOMINAL (5.5J, 6J, 7J etc) width by 2, the imaginary centreline is still in the same place. The ACTUAL width is only useful when calculating backspace.
Last edited by trevorbrady; June 8th 2005 at 07:02.
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