Use your own experience with your bike and its current gearing to determine where to go next. Is your current gearing too low (not enough top end speed) or too high (not enough power for hills or too tall 1st gear making the motor stall very easily when going slow). Once you determine which way you want to go with your gearing a change of 2 teeth on the rear sprocket is a good place to start unless you think your gearing is way off for whatyou ride. An decrease on the rear of 2 teeth will raise your 6800rpm speed to 62.4mph. If you increase the rear to 52 teeth that speed will drop to 57.6mph. A change of 3 teeth would make a difference of 3.6mph at 6800rpm. A change of 4 teeth on the rear would increase/decrease the 6800rpm speed by 4.8mph. A change to 13 tooth front sprocket lowers your gearing almost as much as adding 4 teeth to the rear. A simple division of the rear number of teeth by the front number will give you the final gear ratio. For example 50 divided by 14 = 3.57 and 13/48 = 3.69 The bigger number means lower final gearing and lower speed.
|