I think you simply go for the minimum offset.
Eg I have 6.5j rims with a 43ET, but a 20mm spacer on the front, which brings the ET down to 23mm.
If you have 8" rims that will be about 3/4 inch wider (20mm) each side than yr existing 6" rims. I would not go wider or less offset as it may look good but you may get bump steer and there may be clearance probs ob full lock.
Last edited by seanick; 12th November 2012 at 20:56..
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