AF Clo5e Ratio Gearbox, This is the standard version of our 5 speed gearbox. the ratios are 1st (10 - 45), 2nd (13 - 41) 3rd (16 - 38), 4th (18 - 36), 5th (19 - 34). If set up with 18 - 47 sprockets it will have the following drive ratios, 11.75, 8.24, 6.20, 5.22, 4.67. This slightly larger jump (12%) between 4th and 5th is better for more aggressive riding. When you get to dictate your own road speed, rather than having to ride at the speed of everyone else.