Wheel offset for 68 valaint 2 door post with spring relocation
Offset isn't that easy to measure. It's the distance from the centerline of the wheel to the mounting surface.
Backspace is easier to measure, that's the distance from the outside lip of the rim to the mounting surface. Backspace you can measure with a straight edge and a tape measure. Then you have to do some math to get the offset. Or use a calculator.
I use this Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
It also makes it super easy to compare wheel/tire combinations. So, if you have a set up you know fits, you can compare what you want to run to that. If you know the maximum tire widths for a certain car and suspension/brake set up, you can check to see if your combo will fit. But a lot goes into that, different axles, different brakes, different body styles, factory tolerances, ride height etc. Some of it you can correct for, like a different width axle, some of it you just have to allow a little wiggle room for, like factory body tolerances.
Offset isn't that easy to measure. It's the distance from the centerline of the wheel to the mounting surface.
Backspace is easier to measure, that's the distance from the outside lip of the rim to the mounting surface. Backspace you can measure with a straight edge and a tape measure. Then you have to do some math to get the offset. Or use a calculator.
I use this Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
It also makes it super easy to compare wheel/tire combinations. So, if you have a set up you know fits, you can compare what you want to run to that. If you know the maximum tire widths for a certain car and suspension/brake set up, you can check to see if your combo will fit. But a lot goes into that, different axles, different brakes, different body styles, factory tolerances, ride height etc. Some of it you can correct for, like a different width axle, some of it you just have to allow a little wiggle room for, like factory body tolerances.