Thread: Tire size
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      05-21-2018, 08:34 AM   #15
Opie55
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Drives: '15 650i Convertible
Join Date: Apr 2018
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Just to make sure you understand, if you replace wheels with the same width as you have, then you want ones with an offset that is more or less the same as your old wheels. But if you are getting wider wheels, then you need to take that into account, but only HALF of the new width. Offset is the measurement between the mounting flange of the wheel and the center line of the wheel. So if you buy new wheels one inch wider (25mm), half of that inch is on each side of the center line. So you need to consider half of that (12-13mm) when figuring offset. So if your offset now is 30, and you buy wheels one inch wider, the offset on your new wheels should be about 18 or so. As another poster said, you have a range to play with, so 20 would probably be fine.
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