Factory GM Rally wheel back spacing
March 13th, 2018, 10:40 PM
#3
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Join Date: Jul 2012
Location: Vancouver BC
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Found the information at 442.com
http://442.com/oldsfaq/ofwhl.htm#WHL WheelsTires
http://442.com/oldsfaq/ofwhl.htm#WHL WheelsTires
March 14th, 2018, 07:13 AM
#4
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Location: Northern VA
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Offset is the important metric, but wheel vendors use backspacing because it is easy to measure, if much less useful. The 1960s and 70s GM RWD cars all used wheels with about zero offset. Backspacing for zero offset is half the rim width plus the small additional amount of the inside wheel lip. On a 6" steel wheel, that will be 3" (6/2) plus about 0.25" for the lip, or 3.25" total backspace. On a 7" wide wheel, that's 3.5" plus 0.25" or about 3.75" total. Wheel diameter is irrelevant.
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