what gearing should i run with 18 inch tires. I would like to change only my rear sproket I have an 13 stocker up front. but how much smaller should I go in the rear. I do mostly motocross. I want something for tight and open tracks so someware in the middle. If posible.

 

I run 14/38 for all tracks. In the winter I run 15/37.
ERIC