here's a little formula i found in a 4x4 mag. first, you will need to calculate your final drive ratio. to do this, divide the number of teeth on the rear sprocket by the number of teeth on the front sprocket. (example: 13t front, 44t rear. 44 / 13 = 3.385. so that is a 3.385 to 1 ratio)
next, multiply your new tire diameter by your current ratio. then divide by your old tire diameter, the answer will be your new final drive ratio to work with your new tire size.
then find the front\ rear sprocket combo that comes closest.
86 tri z - might be nearly done throwing money at it! (good thing, the hondas are getting jealous!)
86 250sx - old reliable
83 atc 70-new project for me and the boy
another 82 110
a bunch of golf carts for the wife and kids
-gone but not forgotten-
82? 110 - why did i sell it??
84 225dx - meh, it was a pile