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2016 Forester XT 2.0
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The outer diameter will change. If you want to keep near the same diameter (it helps keep the speedometer closer to accurate) when you go up 10mm in width go down 10 in aspect ratio. so to 235/45/R18. It will ride a bit stiffer as well.
 

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2007 Forester Sports XT 4EAT
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