The King comes stock with 19/43 gearing.... For low elevation riding they suggest 19/40. What kind of mph change would you see with that change? or with 20/39?
One tooth change on a 20 tooth sprocket is five percent, and one tooth on forty is two and a half percent. So going up on the top will raise your top speed from say eighty to eighty four and if you go down a tooth on the bottom you should get eighty six and a half.
