Stock Spocket size

I know this might sound stupid, but what is the stock spocket (front) size on a 300EX? I have some heavier tires on it and would like some ideas on should I go up a tooth or down a tooth on the front.

Thanks
EXer1995

[flaneledholes]

13. The heavier tire really doesnt effect your gearing, if you want to go fast on top end look into the 14&15 fronts, If you want low end grunt get a 12 front and 39 rear.