First: All credits goes to JBear and Antalpromille for the inital designs of the wheels. My work is limited to adapt the axis for the Bosch Indego 1200 Connect lawn mower.
Second: this is a sample of how a wheel for the Bosch Indego 1200 Connect (other models should work as well) could look like. You are using it on your own risk.
Last but not least: I had great fun adapting the design so it fits the Indego. Outcome is a wheel with the following dimensions:
Diameter: 195 mm
Width: 45 mm
It took 14h10m to print one wheel.
Have fun and let me know in the comments your experience with it ;)
I used support material for the axis connector only.