I beleive that if you calculate the rolling mass and take into account the moment of inertia, then divide that by the square root of pythagaris's theorum, that unless you actually knew the size of the tyres and the drag coefficient of said tyre that you would not be able to come to the same conclusion as everyone else, that the correct gear ratio for a 6.5 bonded is 20/78.... congratulations Lee... go to the top of the class
