The VEX Pro system uses a different shaft system than the VEX EDR shafts, so you may have to improvise a bit. The VersaHub system seems to have the mounting holes 1.875" apart (the bolt circle size), and for example the VEX EDR 60 tooth gear has the outer holes 2" apart. So you should be able to file the holes on the gear (or a sprocket) a little bit towards the inside, and then screw one onto each side of the wheel. As the gears have the square hole in the middle that fits VEX EDR shafts, you can then connect the wheel to other VEX EDR components.