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CBR Tech. Gearing Calculator Front Sprocket :   Rear Sprocket : Rear Tire Diameter (inches): 04/05 Model MPH 06/07 Model KPH         Front Sprocket :16         Rear Sprocket : 41           Rear Diameter : 24.8 Tire Circum.      : 77.9    Primary Drive   : 1.604     Final Drive         : 2.563 Gear 1 2 3 4 5 6 RPM MPH MPH MPH MPH MPH MPH 3,000 21 28 34 39 43 46 4,000 28 37 46 52 57 62 5,000 35 46 57 65 72 77 6,000 42 55 68 78 86 93 7,000 50 65 80 91 101 108 8,000 57 74 91 104 115 124 9,000 64 83 102 117 129 139 10,000 71 92 114 130 144 155 11,000 78 102 125 143 158 170 11,650 82 108 133 152 167 180