If you look at the very beginning when they first jump on and before they take off, you can see a wheel. They cleverly tried to hide it by not showing the lower half of the vehicle until it was taking off, but it looks like a regular bike with Hollywood makeup on it, then the CGI takes over.......
There was something that looked like a small wheel but the clip is too grainy for me to make it out (this was after they were flying).
In any case, those are jet bikes with skids. Even the cops chasing them with the machine gun.