guys can you help me decipher front tire sizes??

how does a MH90-21 54H compare to a 90/90-19?

I know the wheels are different sizes; 21 compared to 19. but what about overall height and width? does a 21 have a lower profile or vise versa?

why do they size fronts like this?

i can figure out a 200/50-17 vs a 240/40-18 or car tires for that matter, but the fronts are confusing[sm=smiley23.gif]

thanks

 

The "MH" designation is alpha sizing... kind of a throwback to the way they used to size automobile tires (e.g., my old 440 MOPAR had L60-15 tires). Here is a link that will get you started.

 

http://www.dunlopmotorcycle.com/tire..._tire.asp?id=6