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The german brochure is kind enough to show us the rolling noise for each size of tyre:
For the summer tyres, we can do some math and arrive at the following total rolling noise figures:
18": 77.048 dB
19": 76.548 dB
20": 78.277 dB
21": 78.277 dB
The quietest is the 19" (and not the 18" surprisingly) however they are all within a range of 1.7 dB which is imperceptible. So if anyone was concerned about larger wheels being noisier from a rolling noise perspective, rest easy
(thinner tyres will transmit more road noise through the suspension/bodywork, but hopefully that is negligible too)
For the summer tyres, we can do some math and arrive at the following total rolling noise figures:
18": 77.048 dB
19": 76.548 dB
20": 78.277 dB
21": 78.277 dB
The quietest is the 19" (and not the 18" surprisingly) however they are all within a range of 1.7 dB which is imperceptible. So if anyone was concerned about larger wheels being noisier from a rolling noise perspective, rest easy
(thinner tyres will transmit more road noise through the suspension/bodywork, but hopefully that is negligible too)