Place bike thief in a large copper pot with a special lid that bolts around their neck like a collar, leaving only their head poking out.
Place copper pot & bike thief on top of large pile of primed tinder.
Bring forth all members of bike thief’s family & ritually disembowel them, throwing their corpses onto the tinder.
When all are dead, light fire & slowly bring to the boil.
As he boils alive in agony the last things he will see are the dead faces of his family staring sightlessly at him in reproach.
Either that, or carefully flay him alive & nail his skin to his parents front door as a polite warning not to breed anymore anti-social scum…..