MH90 is the same thing as 80/90. MJ90 is equivalent to 90/90. MM90 is 100/90. Just a different way to show the size.
The first number in 90/90 means approximately 90 centimeters wide, section width (they do vary, though). The second 90 means the sidewall height, bead to pavement, is 90% of the section width. So a 90/90 tire would be approx 90cm wide and 81cm from pavement to tire bead.
"A motorcycle is a spiritual object........
When I ride I'm exactly in the moment........it's like meditation. I'm in the flow."
- Indian Larry
Last edited by mp; 05-01-2010 at 11:29 AM.