Fitment charts list a 2.75-17 as equivalent to a 80/90-17. Sounds about right.
But I took a sec to do the math and 80mm is 3.15in. 70mm almost exactly 2.75in. ??
80/80 is 80mm wide and 80percent of 80mm tall. 80mm wide and 80mm tall would be 80/100.
When a tire is marketed in inches 2.75 indicates 2.75 inches wide and the profile is never specified so we can only guess how tall the tire is. correct so far?
Can someone find me a better explanation to this than the ones I've found so far? (edited)