[07cob]

hp1050

130mm sounds about right for the distance from the bolt up face to the outer edge of the rim. I had mine made up to 125mm for this measurement. Difference can be accounted for in that my rims are 16" and the tyre bulges about 5-10mm from the outer edge of the rim. Your 18"s will have much less bulge, probably about 0-5mm.

As I understand it, OFFSET is the distance from the centreline fo the wheel to the outer or inner face of the wheel. This will be different depending on the width of the wheel. I stopped using the term with wheel manufacturers as each seems to have a different interpretation.

Cheers

Geof