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06-24-2019, 12:56 AM
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Blue 67
 Join Date: Apr 2004
Location: Western WA
Posts: 1,175
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Wheel Mathematical question
Hi:
I am confused about understanding wheels back spacing and offset, even after all these years! First thing first: Back spacing is the distance between wheel mounting surface to the lip of the wheel on the back side, Offset is the position of the wheel mounting surface in regards to the center of the wheel based on its width. Correct? Now, this seems to be a simple calculation unless my understanding of the backspacing and offset above is wrong. For example, If a wheel is 8" wide with 4" back spacing, that means the wheel mounting surface is 4" away from wheel rear lip which means the mounting surface is at the mid center of wheel which is 4" which means the offset has to be zero! So why and how an 8" wide wheel with 4" back spacing can have positive or negative offset? What am I missing? Thanks
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
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