Heres a table of sprocket combination for reference.the stock gear ratio is 2.6 (in bold)the 'Above Stock' gear ratio are high speed sprocket combination.the lower the gear ratio, the more high speed (top speed, less acceleration)the 'Below stock' are low speed sprocket combination.the higher the gear ratio the more low speed. (good acceleration, less speed)Front teeth | Rear teeth= Gear Ratio16 35 = 2.1916 36 = 2.2516 37 = 2.3115 35 = 2.3316 38 = 2.3815 36 = 2.416 39 = 2.4415 37 = 2.4716 40 = 2.514 35 = 2.515 38 = 2.5316 41 = 2.5614 36 = 2.5715 39 = 2.6 Stock gear ratio (Biggest Tire = 100mm)16 42 = 2.6314 37 = 2.6415 40 = 2.6716 43 = 2.6914 38 = 2.7115 41 = 2.7316 44 = 2.7514 39 = 2.7915 42 = 2.816 45 = 2.8114 40 = 2.8615 43 = 2.8716 46 = 2.8814 41 = 2.9315 44 = 2.9315 45 = 314 42 = 315 46 = 3.0714 43 = 3.0714 44 = 3.1414 45 = 3.2114 46 = 3.29so if you want more top speed than stock settingsuse 14t front and 36t rearor 16t front and 41t rearif you want more accelerationuse 13t front and 34t rearor 16t front and 42t rearBIGGER TIRES (100/80 and up): use the below of 'Stock Gear ratio'SMALLER TIRES (80/80 and below): use the above of 'Stock Gear ratio'