After mounting my new Sunny 195/55/16 on my 2010 Wing my speedo is off a bit. Not much- about 1 MPH. If the speedometer shows 60 MPH for example, my GPS says that I am really going 59. It was right on the money at all speeds with the factory Dunlop MC tire that came on the bike. OK, I can live with 1 MPH I suppose, but seeing as that my new Wing was my first bike ever with an accurate speedometer, I kinda hate it for it to be off now, even by a little bit. Oh well.