The default radius is 73mm so this is a big wheel. You can change the radius in the settings by editing,
I will probably update the .scad file so you can set the radius with one parameter.
By default the tire has a slightly smaller inner radius than the rim so I recommend printing the tire with TPU or another flexible fillament. The tire and rim are friction fitted together. I printed it with no infill and I think 3 parimeters which made the tire fairly squishy.
I printed the hub in PLA.
The author marked this model as their own original creation.