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In Reply to: Re: One more.... posted by cosmosmon on February 28, 2000 at 20:55:15:
Remember just one thing and the rest is easy. The more negative the offset, the more the *center* of the rim and tire move outward. This is true no matter how you change the width. If you maintain the same width rim, all parts of the rim/tire move by that amount. But if you want to make a large change in width or offset the main concern is usually whether they will stick out too far or rub on something inside the wheelwell. Refering to Fikse's page on "Widths/Offsets", they have a 7.5" rim with 37.7mm offset. This is 2.3mm more negative than the stock (at least for the 2.8L Z3 with 17" wheels). 2.3mm = 1/8th" is not big change. In my case I got the 8.5"/37.7mm rims on the front. Their center is in the same place as the former example, but to find the location of the inner edge of the rim you need to also add half the change in the width...1/2". Therefore my outer edge is 2.3mm + 1/2" = 5/8" further out. The inner edge is 1/2" - 2.3mm = 3/8" further in. For the rear Fikse's closest match to stock is 8.5"/37.7. No problem!
What the offset actually measures is the distance between the center of the rim and the mounting surface. While this is not a difficult concept, I've found it useless as a way to remember what I just explained. What it does explain though is why the MRoadster's rear rims look so deep. The mounting surface is only 8mm outward of the center of the rim.
: Thanks again. Another great picture of your beautiful car. The rims look fantastic! I think they would look just as good on my cosmos/beige/beige (when it comes in). I really do need help on offsets vs width. Is the 41 mm the std offset? I assume it is. Don't understand what it means to get less or more of an offset. These would be the first aftermarket wheels I've ever purchased. I would want something with the 7.5 front and 8.5 rear. I appreciate any help you can give. Thanks again.
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