By default, it's 48mm in diameter and 18mm thick. Uses 608ZZ bearing put inside during the print (just pause before the layers get printed over the bearing!). Tested with my suitcase and works like a charm, TPE (you can use TPU too!) has worked great and even added more grip to the wheel.
The original Fusion360 design file is attached. If you wish to skip the outer wheel part just scroll back in history and you'll be left with a perfect wheel!
The author marked this model as their own original creation.