Sprocket question

[ejc042]

I have an 84 250R that I am going from 22 inch tires to 20 inch tires. What sprocket change should I make to keep it with the same top end speed it has now?

[TimSr]

About 1 tooth on the front ought to do it. I go 2 teeth jumping from 18"' to 22".

[200Xtreme]

On my "X" I rum a 14 tooth sprocket with 20" tires, and a 12 tooth with 22" tires, and the gearing feels about the same. I would say 1 tooth for every inch tire change. Therefore I would go up 2 teeth on the front sprocket.