Here are some images to make sense of it:
This is the rocker/roller from a balance board, the roller is made of some nice solid plastic and the tires are rubber. But one of the tires has loosened and now slips off during use. I've tried a basic wilko's rubber glue, and some more advanced motorcycle glue (the yellow stuff), but i think that lost one was for rubber on metal.
Any ideas how I can shrink the rubber back? Or what kind of adhesive would dry with enough flex that it wont crack and fail? I guess I need a flexible bond.
This is how its used: