Duplo Super Monster Tire

Inspired by JonsBronnu's wheels, I created a huge Duplo monstertruck tire and mount block for my son (who's obsessed with Monster trucks).
The wheel is 3 deep by 6 diameter duplo size approx. The mount block is 3x4.
To assemble it you need at minimum an M8 50mm long bolt, ideally an 85mm long one. Head can be Hex or inbus, it supports both. You also need 2 M8 nuts, and a 16mm M8 spacer. The hubcaps just snap in place. The two rim halves spin loose of the tire sometimes, i don't think it's an issue, but maybe you can glue them, or it might be worth making a splined edit of the wheel + rim combo.
There is a version of the rim that uses 608ZZ skateboard bearing, they need to be inserted with pauses. I don't use it, because it spun less well than without (I suspect lateral clamping force isn't great on the bearing, or just bad bearings). Feel free to try it out.