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Hi, I have just replaced the standard 17” wheels and Yokohama tyres (225/45 R17) with 16” Lexus wheels and Michelin Cross Climate (205/55 R16). Both wheels have E45 offset. The 17” wheels were 7J and the 16” are 6J.The comfort and noise are both better. I measured the decibels on the original wheels and theme again with the new wheels over the same stretches of road at the same speeds using a decibel meter app on and iPad and it showed a reduction in noise of around 6db. The noise was around 70db on the original wheels.
 
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