AN ABSOLUTE BONE STOCK, MEANING UNTOUCHED MOTOR/SPROCKET/TIRES will go go between 70-75MPH. Only reasons why the quads MPH will alter will be climate/altitude and if its a manufacture rocket. This quad wont go anything over 75MPH stock. Pipes/Cherry Bombs/Tuners/Airboxes/Airfilters will do ABSOLUTELY NOTHING FOR MPH. Those mods only lower ETS, but will not increase MPH. Gearing will only alter the mph.