I have a 300ex with a big bore, hmf pipe, k&n filter, and jetted. It has 20" tires and hits the rev limiter constantly. The problem is that i ordered a 14t sprocket and when i went to change it the previous owner welded the front sprocket on. So what i need to know is what rear sprocket size would be the equivelant to a 14t front. I know the 14t front makes up for the drop in tire size.