Offset and backspacing—why do these two things contradict each other?

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Skor2003

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Why do these two things contradict each other?

6” wheel with 3” off backspacing = zero offset.

CDD052DC-33E9-4A3D-8B93-8E030BF909B0.jpg


This chart indicates differently. The way I read it, 3.5” of backspacing = zero offset. What am I messing up?

EF049E00-EB1C-4F41-85B6-04146972E268.jpeg


57428FC8-998A-43CE-9574-EDEDAC586AFE.jpg
 
Generally because the top picture is wrong. The inside of the rim is the width and the chart assumes the width of the lip on the rim is 1/2" similar to a 15" wheel being 16" in outside diameter. That's why the chart isn't what you'd expect.
 
Skor2003 said:
So the chart is a very specific chart for a 1/2” lip?

Where the picture and text next to it are for “no lip”
Click to expand...
The chart is just an estimate and seems to be using 1/2". This is probably part of the reason using backspacing is good, there isn't any guesswork. I think it can be helpful to understand how everything fits together so you can have a reasonable discussion with anybody about wheels regardless of the terms they use.
 
pagrey said:
The chart is just an estimate and seems to be using 1/2". This is probably part of the reason using backspacing is good, there isn't any guesswork. I think it can be helpful to understand how everything fits together so you can have a reasonable discussion with anybody about wheels regardless of the terms they use.
Click to expand...
This IMO
 
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