I was very disappointed and dissatisfied because it is advertised with a top speed of 46 mph. However some idiot decision maker decided to limit the speed settings to 15Mph. The manual shows how to adjust the limits, but it's either defective, or the instructions are wrong. It does work. I went online, and this is a common problem, and all the advice I've seen has no effect. So I'm waiting to see if the email I sent is answered promptly. If not I'll be returning this bike and going with a different model, and not one made by this manufacturer. My wife's bike is half the cost, and smokes mine because they had more intelligent designers.