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Just a terminology thing. The width of the wheel is the inside width at the tire lip. The offset and backspacing are measured from the outside edge, which typically adds 1/2" on either side. So the backspacing is based off of a 9" wheel, hence the non-zero offset.
So, given how close my stock rimmed tires are the the exhaust and E-brake etc any aftermarket wheel, no matter what the diameter wants yo be 4" back spacing or less to guarantee clearance?
Backspacing is measured from the inside, outer lip of the wheel to the mounting flange, while offset is measured from the center of the wheel to the mounting face. That 12mm (1/2”) is the difference between the outer lip of the wheel and the inner lip where the tire mounts.
Backspacing is measured from the inside, outer lip of the wheel to the mounting flange, while offset is measured from the center of the wheel to the mounting face. That 12mm (1/2”) is the difference between the outer lip of the wheel and the inner lip where the tire mounts.
Gotcha,
As my previous question - if looking at aftermarket wheels, to maintain and not exceed current and tight inner clearances, I need a maximum of 4" back spacing, irrespective of width and offset?
Wheel offset / back spacing question
