Kromlech have posted a preview of their post-apocalyptic Mono-wheel accessory set.
From their announcement:
I’m really happy to show you complete Post-apocalyptic Monowheels set. Image of first monowheel was posted long ago, but now you can see second, rather fast monwheel (jet engine) and pair of new rusty metal legs . These little mechanical beauties are designed by Hamster_52.