So trying to stay true to that “Rust feel” here are some suggestions I think would be interesting…
Note how the front tire was replaced with wood. Got that rust look already. Should make it so you take damage if you crash or getting hit makes you fall off (for game balancing purposes).
Small, loud motorbikes that help players travel distances.
Allows users to get up to 2nd story spots. Requires balancing (maybe a balance meter?) and practice. Great for raids, racing, and to impress nakeds.
With water collection soon in place it makes sense to make add garden’s to plant stuff. Maybe make some herbs that give short term buffs, like ginseng making you run a bit faster or heal better.