I went up to 285/*75* on my Willys and used a few speedo apps (GPS-based) on my phone and my wife's and ended up being that the speedo was either spot on or less than 1 MPH off.Took the little Willys to dealer for re-calibration of speedo after going up to
285/70/17 tires. Hoping that it brings back shifting points to normal. Not sure if it’s a self correcting issue as stated in some threads I’ve e seen around. Anybody want to chime in and let me know what to expect besides the $155 fee. Which I’m ok with .