Pete,
I'm not sure about that chart .. but the best way would be to get some measurements from the wheels.
Measure from the inside lip (towards the chassis) of the wheel to the mounting face of the wheel. This is the backspacing.
Measure the total width of the wheel from inside face to outside face. Eg .. my 18x10's measure 11" wide.
From these two measurements you can calculate the offset.
Offset,mm = ((wheel width,inches / 2) - backspacing,inches) * 25.4
Anyhow, you can take the backspacing measurement and measure from the mounting face of your rear type 3 drum to the spring plate. For the wheel to fit without spacers, the measurement from drum to springplate must be more than the backspacing measurement of the wheel.
Now measure from the mounting face of the drum to the inside of the fender lip. This measurement has to be more than the total width of the wheel minus the backspacing.
Get it ? Hope this helps.
Sandeep
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