19" vs 21" tire test on Model S

I tested five different tires and measured noise and energy consumption on a Tesla Model S:
21” Michelin Pilot Sport 2: 64.6 dB, 147 Wh/km, 237 Wh/mi
21” Achilles ATR Sport 2: 62.9 dB, 146 Wh/km, 235 Wh/mi
19” Michelin Primacy 3: 62.0 dB, 133 Wh/km, 214 Wh/mi
19” Roadclaw RH660: 63.3 dB, 131 Wh/km, 211 Wh/mi
19” Nereus NS601: 64.3 dB, 137 Wh/km, 221 Wh/mi

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