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Plus "offset", which is the the distance between the center point of the rim and the surface where the wheel meets the hub on the car. The Focus' offset is +50mm, I think. I wouldn't want to vary from that by more than 5 or 10mm. Odd handling, poor straight-line stability, even accelerated bearing wear can occur.
You can find a better explanation of all this at Tirerack.com.
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