This unfinished page contains text from either the 2003 or 2005 print version of Encyclopedia of Surfing. An updated version, with more photos, is coming soon.

Surfboard design used on virtually all shortboards and big-wave boards, and about half of all longboards; often described as the second most significant board-design advance, following the shortboard revolution. The tri-fin has three roughly equal-sized fins arranged in a triangular pattern: two matching side fins placed symmetrically just in from the rails, about 11 inches from the tail, and a re...

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