Hi there, I need some advice... I just purchased a grubee 66/80cc starfire kit... though i do not know how many teeth the sprocket it includes has... Anyhow, what I am wondering is what type of sprocket tooth count would be right for my bicycle? Bicycle wheel is 20"!! So this is why I am wondering, since I don't see many motorized bicycle with only 20" wheels... Another concern is that where I live there are many hills... which sprocket would be best for pedal-helped hills, and with the fastest speed, on 20" wheels... Thank you!