I can live with the speedo change. Mine is currently around 5.5% high and the 235/50-17 should only increase 2.2% from the 205/60-16's (If they will fit)

Which leads into another question: Has anyone had a problem with speedo accuracy? They swapped out my speedo and it had no effect. When the dealer called the factory, they said that the tolerance on the speedo is plus or minus 10% (which I think is outrageous. Odometer is dead on. They say that the odometer and speedometer both use different speed sensors. I'm trying to get them to swap out my speedo sensor but I'm not having much luck. (FYI - calculating speed by time through a distance or 3600 divided by the number of seconds that it takes to travel a mile)