LT, thanks for sharing your experience. That's the type of info I'm looking for. I'm just about set on getting 16s and using 225 75R 16s to achieve a diameter of 30". (Currently is 28 1/2) So.... How will this affect the accuracy of my speedo? Logic tells me that it will read slow... but HOW slow? What does your speedo do and how tall were the original tires?