They're not driven by belts, they're free spinning. Bodge job came yester day and I needed some bearings. I saw his scooter and thought 'hmmm' , so I took my 10 quid scooter apart and in each of the wheels were 2 bearings.That is a cheap way to getwhaeels and bearings. But, I'm not using that way as the bearings are to big for the blue wheels.