The next step was to make the front 2 wheels able to turn. To do this i started by selecting the group i had created for one of the wheels to spin and again clicked ctrl+g to create another group on the outside of this and made sure the pivot point was in the centre again. I then created a double headed arrow and deformed it so that it would curve around the front of the car slightly. I then selected both the controller arrow and the wheel and applied another orient constraint, this time in the y axis. lastly i made sure all other movements were limited appropriately and repeated the process for the opposite wheel but using the same arrow as the controller.
Rigging 