Tire sizes/mph
#1
Tire sizes/mph
First off, what measurement is used for tires?
My chip has a thing where you can enter the stock tire size and new tire size and it'll tell you how fast you are actually going, but it asks you to enter the sizes in inches.
I took a guess at the original measurements being in centimeters so I entered the stock tire size (245) as 96.45" and put the new tire size (315) as 124", but what my chip is telling me doesn't seem right. When my truck speedometer says 40mph, the chip says 52mph.
So 1) am I doing the conversions right? and 2) are chips credible enough to be used accurately to gauge speed? (It's an Edge juice w/ attitude chip on an '02)
Just wondering
My chip has a thing where you can enter the stock tire size and new tire size and it'll tell you how fast you are actually going, but it asks you to enter the sizes in inches.
I took a guess at the original measurements being in centimeters so I entered the stock tire size (245) as 96.45" and put the new tire size (315) as 124", but what my chip is telling me doesn't seem right. When my truck speedometer says 40mph, the chip says 52mph.
So 1) am I doing the conversions right? and 2) are chips credible enough to be used accurately to gauge speed? (It's an Edge juice w/ attitude chip on an '02)
Just wondering
#2
Diesel Bomber
iTrader: (1)
That a tape measure and measure the tire on level ground from the bottom to the top of the tire.If you want to get very accurte use a level.It should be in inches.
If the tires are 31 1/2 inches,it will be 31.50, or if they are 31 1/4 inches it will be 31.25.Does this help?
If the tires are 31 1/2 inches,it will be 31.50, or if they are 31 1/4 inches it will be 31.25.Does this help?
Last edited by turbo20psi; 09-06-2010 at 09:49 PM.
#10