Just installed 215/50HR/17 tires on new alloy wheels (+40 offset). Awesome look and driving feel, a lot less bodyroll when cornering hard. However, the overall radius of wheel is about 16 mm taller than OEM. Yes, the speedo/odometer reading is slightly off because of that (<5%, indicated speed is less than actual speed). For example, if odometer says I drove 100 miles, the actual distance was about 104~105 miles. That's better than the other way around.