Thread: Q about changing 18'' rims to 20'' rims
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Old 03-28-2007, 07:07 PM
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the ET refers to the offset in millimeters. The offset is the distance between the mounting surface of the rim and the centerline of the rim.
Tirerack.com has a good explaination of offset. Read it, it'll make more sense than what I can explain here.

http://www.tirerack.com/wheels/tech/...jsp?techid=101
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