[Smokin]

Help me figure this out. What's the difference between offset and backspacing? Which number moves the wheel/tire in or out from the strut?

 

[iLiptiKal]

 

[Methane Herder]

IIRC, et is the positive (toward the outside) or negative distance from the C/L of the wheel's rim to the flange face of the wheel's spider. Back space is the measurement from the back lip of the rim to the flange face of the wheel's spider. Back space is typically a positive number, et can be a positive or negative number.
MH

 

[Dyn085]

 

[jimclark]

The video was pretty clear, and helped assure me that I was correct in assessing the inside v. the outside of the wheel in the diagram above.

I now think of backspace simply as the depth from the mounting face of the wheel to the inside rim. Offset is the distance of the mounting face from the centerline of the wheel--that is, the distance that the mounting face is offset from the wheel's centerline. If the mounting face is moved from centerline to the outside, it is positive offset (and gives a greater backspace), and if it is moved to the inside, it is a negative offset, and the backspace is reduced.

 

[Smokin]

I like pictures.

 

[OrangeFist]

ok, so does that mean a higher offset number mean the wheel sticks out more?
sorry if its a dumb question

 

[JustinP]

ok, so does that mean a higher offset number mean the wheel sticks out more?
sorry if its a dumb question

Other way around, smaller number for offset, wheel sticks out further. In truck applications, you'll Alot of times have negative numbers.

 

[OrangeFist]

Other way around, smaller number for offset, wheel sticks out further. In truck applications, you'll Alot of times have negative numbers.

Thank you!