Yeah, I was figuring that going from the 235/45ZR17 to the 235/55R17 size would make my speedometer pretty much dead on. I've heard the the Michelin Pilot Sport A/S, Pirelli PZero Nero, or Falken 512 are all very quiet, smooth tires. The Michelins sound like they're more performance oriented than I'm looking far. Does anyone know a better set for road noise and smoothness, or are those the best?