Bikes are equiped with front blades that are razor sharp. A Pilot may attempt to attack an exposed apponent with those blades in flight by making a Piloting check as the attack roll at 2 Difficulty plus 1 difficulty in difference between the atatckers handling and the defenders handling if on spereate Bikes. Plus any additional modifiers based on Manuevers, armor and so forth. damage is upgraded by =2 damage (or minus 2) in the difference ebtween attacker and defenders speed.
Can be used against another Vehicle as well, though Threat may be used against attcker to damage his bike instead at 2 threat per point of damage.