Where did you find the model # on the bike? Guessing the speeds are low to high as listed by model # listing in owners guide and parts list to accommodate various speed restrictions throughout the United States. On the page 23 in the parts listing number 10 is the only part throughout the entire breakdown that varies for the three model numbers. I wonder if they restricted this bike via variation rather than constricting the motor.JBOT will probably have some more info on this. I have the same bike and stock I'm pretty sure it went close to 30 before I fuckered around with it.