to keep speedo accurate
use a tire size calculator, like this. Many available.
http://www.1010tires.com/tiresizecalculator.asp
use a tire size calculator, like this. Many available.
http://www.1010tires.com/tiresizecalculator.asp
Thats what I have and my speedometer still reads the same as my GPS.for 17's 215/45's are as close as it gets with out being dead on