In the darkest hours, some of us have had to resort to taking the bus home. If we're on a hill, we duct-tape the pilot to the steed, light them on fire, and give them a Viking funeral. If we're at the bottom of a gravity well, we strip them both for parts and bury the remains in the nearest trench. The Forbidden Zone is riddled with treacherous mutant-ridden cesspools of radiation which must be fully explored and subdued. Trikes, of course, dominate these areas.
Trikes can go anywhere.
We need to replace fallen pilots as well as fallen cycles. This is easy to do - we ride around the neighborhood and find kids who are sick of their parents. We take them to the Secret Hideout, fill them with beer, and stick them on whichever bike is currently the hardest to ride. If they don't cause any serious damage to themselves, we let them stick around.