That is the aspect ratio , or ratio of width to height of the tire
The aspect ratio is the tires profile. For instance, a tire with a 60 aspect ratio means that the tires hight from tread to rim is 60% of the tires nominal width. The lower the aspect ratio # the wider the tire.
Is called the aspect ratio.
The aspect ratio of a tire means The ratio of height to width. Reference, Automotive Steering, Suspension, and Alignment, Book Fifth edition Chapter 3. Page 60.
They come in many aspect ratios from 45 to 80
They go from 45 to 75
Yes, the smaller the aspect ratio the wider the tire.
It means it is a radial tire with 70 aspect ratio.
No a 70 aspect ratio tire would be taller than a 65.
Depends on the aspect ratio of the tire. For instance a 215/70-16 and a 205/75-16 are almost the exact same diameter with the 205 tire being 1/4" larger in diameter because it has a larger aspect ratio. For all practical purposes they are the same height. I would have to know the aspect ratio of both tires to answer the question.
Usually, it'll be XXX/75R22.5 or XXX/80R22.5, with "XXX" being 275, 285, or 295. On a 22.5 inch wheel with a 75 aspect ratio, it'll have a diameter of 39.33 inches. With an 80 aspect ratio, it'll have a diameter of 40.45 inches. A 24.5 inch wheel and tire will have a diameter of 41.33 inches with a 75 aspect ratio and a diameter of 42.45 with an 80 aspect ratio.
205 is the width of your tire the 65 is an aspect ratio that determines how tall the tire is compared to the width