how to convert tire sizes?????

[skyscooter]

what size would a 2.15 x 18 and a 2.75 x 21 convert to in us terms such as 100/100-19.

[John22j]

look down a little on this page:

http://www.kgmotorcycletires.com/find_your_tire_size.htm

[skyscooter]

thanks, that's just what i was looking for