Quote Originally Posted by Marshy View Post
In addition to. So, if for example, if out of a particular corner they need the motor to be at slightly higher revs for maximum drive, they can change just 3rd gear (or whatever) to be a tooth shorter or longer, without changing the overall final drive (ie having too short or long gearing for the main straight), or wrecking drive out of 2nd gear corners etc.
this give the added advantage of not stuffing up suspension/geometry settings that comes with the the change of wheelbase length when changing sprockets