Metric Tire Break Down and conversion Standard

Your tire is LT 245 / 75 R16 heres the break down in order

Type - LT = Light Truck

Tire Width - This is the width of the tire measured in millimeters from sidewall to sidewall. An example might be 245 representing 245 millimeters.

Aspect Ratio - This is the the ratio of the height of the tire's cross-section to its width. An example of this might be 75, which means that the height is equal to 75% of the tire's width. To calculate the aspect ratio, multiple the first number (e.g. 245) by the second number with a decimal before the number (e.g. .75). Using the example numbers the tires aspect ratio would calculate as 245x.75=170 where 170 is the tires height in millimeters. This is the height of the rubber from rim to tread on one side of the tire.

To convert the aspect ratio to a full tire height in inches, do this:

Convert the above calculated tire height (aspect ratio) in millimeters to inches by multiplying the millimeters by .03937 (170 x .03937 = 6.5 inches). Then take the inches and multiply by two and add the rim size. Example: 6.5 x 2 + 16 (rim size in inches) = a 29 inch tall tire do the same for width (245 X .03937 = roughly 9.50)

Rimsize = R16 your rimsize equals the number that fallows r in the code

so in comparison LT 245 / 75 R16 = LT 29X9.50R16

my sorce if you wanted to read all of it (sounds like you do )

http://www.offroaders.com/tech/AT-MT.../tire-tech.htm
just copy link into browser as i dont know how to make a clickable link