I plan on getting the biggest 2 stroke happy time engine availible soon, and noticed that the back sprocket is HUGE. So I plan on buying a new sprocket from kings. I want to be able to reach a top speed of 40-45 mph, but still be able to get up those hills pretty well. I was thinking a 32 tooth, is that a good size for what I want? By the way, this will be on a standard 26" wheel.