Can you get an online catalogue of tyres? Or at least a bunch of pictures which you can put together with prices and specs. Present to the class and get them to compare them by answering leading questions. Can you have them associate different tyres with different vehicles and situations (e.g. for off-road, for wet surfaces) and say why?
But to be sure you really want to ask your course tutor for help here; that is what they are there for!
