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      04-01-2016, 03:24 PM   #2
.BMW.
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Drives: BMW F11/F31
Join Date: Jun 2013
Location: Sweden

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With larger wheels the tire profile is reduced, which means that the overall tire diameter is kept almost the same.

The tire profile is reduced by 5% for every inch in wheel diameter increase.

For example for 225 tires:
225/45-18, tire diameter 25.9"
225/40-19, tire diameter 26.1"
225/35-20, tire diameter 26.2"
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