Thank you very much.
An air breather is indeed bad news when it comes to the Godot setting.
However, it seems a Stirling engine - in this case of course a bigger one -
could be an interesting way to produce energy from solar radiation without
having to first produce solar cells, which would probably be impossible for
the Godot colonists.
This solar energy could be used to reload power cells, and the power cells
could provide the energy for the bikes or trikes - making them perhaps a bit
heavy, but on the other hand the 0.85 g of Godot could help to keep that
problem comparatively small.
If the GURPS system I use allows me to build a bike or trike that can run for
six hours (the average oxygen supply of an environment suit, and therefore
the maximum time a colonist can normally stay outside of the habitat) on bat-
teries with a speed of at least 30 km/h off-road, I will most probably use that