What is outside to outside of tire measurement?

Answer 1

A typical tire measurement is given in three parts.

Ex. 255/55/R17

This measure ment means: Tire width in mm/Aspect Ratio/ Radial design on a 17 inch wheel.

The aspect ratio is the width/height of the tire. So in the example given the aspect ratio is:

55=255/height

So find height

255*.55=140.25mm

140.25mm=5.5 inches

So the overall height of the tire= (5.5*2)+17=28 inches

You can use this series of calculations, or search for an online calculator that will do it for you.