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Thread: Verify backspace calculation
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03-07-2008 #1
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Verify backspace calculation
I’m getting ready to order my wheels and would like someone to verify that my math is correct.
The wheels are 18x9.5 ET20. Do you come up with a backspace of 6.04”?
Thanks
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03-07-2008 #2
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6.023622 to be exact!
Check this link out and plug your numbers in ....... http://www.rims-n-tires.com/rt_specs...&text1=&text2=
03-07-2008 #3
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Thanks!
03-07-2008 #4
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Whch car? the Firebird is different from the Camaro is different from the Chevelle
03-07-2008 #5
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Sorry, Firebird. I knew that the backspacing should be 5.5 inches for a Camaro or Firebird. My Firebird has a 1971 Chevelle 12 bolt rear end in it. I believe that rear end is 1 or 1.25 inches wider than a Camaro/Firebird.
Originally Posted by ProdigyCustoms
I probably should have rephrased the question. What I was trying to figure out was, what the distance was from mounting surface to the back edge of the wheel. I figured it to be 6.04 inches and wanted to verify that my math was correct.
9.5*25.4 = 241.3 mm
241.3mm/2 = 120.65mm
120.65mm + 20mm(ET) + 12.7mm (1/2 inch for the lip converted into mm) = 153.35mm
153.35mm/25.4 = 6.0374 inches
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