I was wondering if I will have to go up or down on front sprocket size if I get 20" tires instead of the 22"tires. I was also wondering if I got 20" tires and went up 1 tooth bigger on the front sprocket how much top end I would gain and if I would lose a lot of bottom end. Thanks!!!!!!

 

Your top end will be close to what you have now after going up on the front AND going to the 20" tires. 300EXs do well with a 14-T in the front regardless of your tire height. There is plenty of power to pull the taller gearing.

KNOWSALOT