First pick the size of the wheel, the biggest advantage of the small wheel is not to the surrounding environment caused by interference. The body and shoulder width, as long as people passable, the car can pass, and I have tried, on the elevator, the big round to take the freight elevator, small wheel can take the passenger ladder, because the area is a person's position.
If it is more people's streets and business circles, the car is relatively flexible, it will not overwhelm other people's feet, more suitable for personal home use. Look again at performance, inside in the United States. The internal structure of the General people do not understand ah? How to choose? Small series to tell you two strokes, one is to put the car flat, upright in the ground, and then look at the vehicle shaking not shaking? If shaking, the core elements of the inertial navigation system is not sophisticated enough, this is easy to see. The second trick is to put it on the slope of 15 degrees, and then see, different cars, high and low. If you can not move, it shows that the drive and sensor system performance is stable, you can buy at ease. If you can see the use of these two strokes, it must be an expert.
So a lot of cars, looks like a similar appearance, really much worse. The last point is security. This can not be vague, I think there are many children use, security is too important. To start from the wheel, some of the wheels exposed, domineering very, but a bit dangerous, after all, driving the wheel to tell the rotation is very lethal. If the child rides, must buy the wheel to wrap up. Another is the domestic not too concerned about the escape problem.