Quote from the Ebay sale: [ QUOTE ]
Brand new aero helmet fin for all makes and model helmets. Full face and motorcross helmets will have dramatic increase in aerodynamic and downforce stability, tested in wind tunnels (virtually no lifts created thus neck fatique reduced and less vibration when traveling at high speeds).
[/ QUOTE ] :lol:
The fin is a piece that looks like the dorsal fin on a shark. It attaches to the underside of your swingarm near the rear sprocket.
It protects your feet/hands and whatnot from being pulled into the rear sprocket/chain in the event of a crash.