Tim240z Posted January 13, 2004 Share Posted January 13, 2004 OK, so lets say I need an 8 inch wide rim, with 5 inches of back spacing, is my calculation correct that the offset would be +1 inch, or +25.4mm? That sounds right to me. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted January 13, 2004 Share Posted January 13, 2004 Thats sounds right to me! Guy Quote Link to comment Share on other sites More sharing options...
blueovalz Posted January 13, 2004 Share Posted January 13, 2004 Broken down, I see 1/2" offset. The 8" wide rim (inside of lip to inside of lip as the industry norm for measuring a wheel width) is usually 9" from outside of lip to outside of lip. The 5" BS is based on a measurement from outside of lip, so this is why I used the 9" reference. Thus the 5" BS on this wheel is only 1/2" offset from a 4.5" centerline. Now if the 8" you are making reference to is actually outside of lip to outside of lip (which makes this a 7" wheel), then yes, the offset is 1". Quote Link to comment Share on other sites More sharing options...
z-ya Posted January 13, 2004 Share Posted January 13, 2004 I agree with blueovalz, the overall rim width of an 8" wheel is 9". Divide that by two to find the zero offset backspacing. The difference between the desired backspacing and the zero offset backspacing will be the new offset. Offset = backspace - (width/2) = 5 - 4.5 = 0.5 Pete Quote Link to comment Share on other sites More sharing options...
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