-measure what wheels/tires you have on there right now....
-measure the distance from the rim AND tire to the fender
-add HALF the distance to the width of the wheel of whatever the measurements from the rim AND tire to the fender (your wheel will be wider but in the same position theoretically because you havent changed offset yet)
-since your wheels got wider, the offset width has changed, but the offset of where the wheel pad meets the wheel hub has not changed in terms of offset...So you have to factor in difference between your stock wheels and your new wider wheels to determine new "offsetted" position
-now that you've got your width calculated you need to figure out offset
-repeat the measurements from the rim AND tire to the fender
-1 inch = about 25.4mm or something like that
of course all of this depends on your tire sizes and alignment settings....
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