Hi All, yea I am new here, but I would like to hope that I can contribute as much as I can help.
For starters, looking in the tire and wheel forum I have seen many posts where poeple were asking questions about different tire sizes and things like how much the speedo would change and teh like. well here is a TIRE SIZE CALCULATOR that everyone can use. you just put in the size of the tire you have as you stock tire, and then the size of the NEW tire you want to use. it will show you the NEW and OLD tires sidewall hieght, radius, diameter, circumferance, REV's/Mile, and at the bottom the Speedometer reading for the NEW tire, and how much difference it will make at 60 mph.
Hope this helps everyone.