Factory GM Rally wheel back spacing
Thread Starter
Registered User
Joined: Jul 2012
Posts: 2,990
From: Vancouver BC
Found the information at 442.com
http://442.com/oldsfaq/ofwhl.htm#WHL WheelsTires
http://442.com/oldsfaq/ofwhl.htm#WHL WheelsTires
Old(s) Fart
Joined: Mar 2007
Posts: 50,802
From: Northern VA
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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The Stickman
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Jan 11, 2009 05:15 PM
