hey fellas i need how i would accurately calculate how much difference the speedometer will be affected. or if you could give me your tire size on the truck now, what stock was, and much faster your speedometer is. i'm a pretty smart young gun and could come up with an equation if there isn't one. all us guys that like to put bigger tires on then would be satisfied. all they would have to do is plug in some numbers and do some math. any help would be greatly appreciated.

fordkicksass

 

http://www.miata.net/garage/tirecalc.html