I just got the edge and need some help!! I hate math and i need the Tire measurment for the millimeters for some 315/70/17 inch tire.I love this thing just hate math.

 

Check some or the tire manufacturer's web sites. Some have a measurement list and a conversion chart. Good luck.

 

Sorry i think i got it.. 2740 but the edge rounds it up one point so well see after work.thanks...i used my one cell left.

 

First Number (315) divide by 25.4 Multipied by the 2nd Number in Percent
(70) multipied by 2 and add the last number (17) should give you a tire height of 34.4 inches.

315>25.4=12.4" wide
12.4x70%=8.7" sidewall height
8.7x2=17.4" Two sidewalls top and bottom
17.4+17=34.4" add the 17 as it is wheel dia.

34.4x3.142=108.1" circumfrence

108.1x25.4=2746 mm circ.

 

cool thanks.i drove home with the number i got from the book and i thought it was ok.i will try that other number tommorw.So is my number wrong?Thanks

 

I doubt it will matter as 6mm is less than a 1/4". I am guessing you were looking for circumfence. I know the formula above sometimes does not quite come out with the same results as what some of the tire manufacturers say their tires are in height, but it is alway extremely close.

 

If you open the lightning software from Edge, it has a calculator for the tire sizes. Just put in the new tire size and leave the squish factor at the bottom at 5% and it will give you the right size. I done this and it was dead on with the size when I measured the size by marking and rolling.