Upgrade done
I just replaced the 205/60R15 tires on my 2010 CSC with 205/70R15 tires. Yes, the speedo is off approximately 9% in 5th gear but I already have a speedo corrector on hand to install. The right side tire was a bear to install but a pry bar, pinch bar and 5 lb hammer helped. While up on the jack, the tire rubbed the front lip of the fender when I first got it on, but that problem cleared when I lowered the trike. It's a little close but the road test proved it's not an issue. Apparently having the full trike weight on the wheel increases the clearance. Besides getting higher speed per rpm, the ride is actually smoother, probably because of the larger diameter of the new tire.