I had first 255/30/20 and 285/30/20 of yokohama advan sport, I always felt the front tires were giving harsh side plus the speedo error was there as well, so I upgraded to 255/35/20 and now it feels so much better, there is literally no harshness and road noise.
what exactly are you feeling with your current tire setup, and now if my speedo is on 100m/hr I am actualy driving on 99.5 m/hr
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