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Originally Posted by .BMW.
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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Thanks. So I guess one has to be careful in choosing the tire and rim size to keep the overall diameter the same? If overall diameter is different it will effect the speed and distance calculations?