I hear that about smooth, micros are all about that, if you try and throw them around you will be going for a wild ride...but even driving smooth the 45's just arent hard enough...You wouldn't believe how fast we got these little cars going and the incredible part they are ultra-durable...knock on wood I have yet to break a part on my car and I have run it about a dozen times...XRay makes a great car no matter what the size