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Shark Fin ®
From WikiPedalia
Shimano trademark for a chainstay protector with a projection near the front that was intended to keep the chain from getting jammed up if it overshifted the small chainring. This projection was triangular and resembled a shark's dorsal fin, hence the name.
This product was made of black plastic, with a peel-and-stick backing and a zip tie to hold it to the chainstay.
