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Old 02-19-2013, 10:42 AM
Princeton Princeton is offline
Location: Princeton, New Jersey
Join Date: Jan 2008
Posts: 268
Mein Auto: 2008 335cxi
The width of the tire that you can fit on the 18" wheel you are considering is a function of the wheel width and the space under the wheel well. To determine if you need a spacer/what size spacer, you first need to decide what tire size (not just diameter) you want to run. The Tire Rack can help you with this. Once a tire is picked, they can tell you how wide it is. Then by using the offset of the wheel (spec also available from tire Rack) along with 1/2 the width of the tire, you can calculate how much space you have left. This will tell you what size spacers to consider.

All of that said, you would be well advised to follow BashedBarrique's and Bear AV's advice on the spacers. I'd go as wide as the wheels allow, and acll it a day.
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