I wouldn't go stomping his ass, just yet anyway. First take him to court and make him pay. Then find out where he lives and trash his shit, dont get caught. Then if you feel you still have to stomp him, wear a ski mask and sneak up on him so he can't prove its you. Remember, assault is a felony offense, its not worth ruining your life over a bike, so DONT GET CAUGHT. I totally understand your anger though, so I would stealthly KICK HIS ASS.