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Message: <blockquote data-quote="ReplicaR" data-source="post: 792473" data-attributes="member: 9209">Here is the illustrated explanation. I've used MS Paint to just put down some diagrams<img src="http://i56.tinypic.com/6dquyt.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />This is a diagram for the zero offset wheel. As you can see, the wheel is perfectly centered on the axle, which means that both sides are the wheel are even, as represented by distances A and B. <img src="http://i52.tinypic.com/x2m4vk.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />When you add positive offset, the wheel gets pushed out of the fenderwell a little bit, and you could see that now more of the wheel is on the outer part of the axle axis.<img src="http://i53.tinypic.com/2a5m6uv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />When you add negative offset, the wheel gets pushed back inside into the fenderwell towards the center of the car.<img src="http://i55.tinypic.com/ztglec.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Now, here is how you calculate the needed offset for the car. First you measure the distance between the axle axis and the edge of the fenderwell (distance B on the diagram). Then you measure the width of the wheel lip to lip, and divide it by 2 (distance A on the diagram). Then you take distance B and subtract distance A from it. The result you will get will be your offset, whether it's positive or negative.</blockquote>