I spoke with a RAD tech today (someone you can't speak to when calling the toll free number). He said the RAD City 5 Plus and the RAD Rover 6 Plus (two of their most current designs) are almost twins. The only motor difference is sizing because the Rover has fat tires and the City has thinner tires. The tech was very knowledgeable about RADS in every respect we covered. But the motors are in every performance and standard respect the same. There's a lot of stuff posted on forums like this that are at best, uninformed. For some others it's frankly just axe grinding without revealing why.