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1" = 25.4mm
Divide 25.4mm by 2 = 12.7mm This is because, if we line up both wheels, the 8" wheel will be wider by 12.7mm on either side over the 7" wheel.
48 offset minus 45 offset = 3mm of offset
12.7mm + 3mm = 15.7mm, which is approximately 16mm, meaning the surface of the new wheel will stick out 16mm more than stock.
16mm = 0.63"
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