Abstract: The present invention discloses a limited pivotal fin system 12 for a surfboard 10. The fins self-pivot as the surfboard is turned by the body weight of the user. The pivotal fin system includes an upper stationary mounting portion 18 attached directly to the underside of the surfboard 10, and a lower pivoting fin 12 with a limited rotational pivoting mechanism 16 located in an upper recessed area 28 on the leading edge 26 of the pivoting fin 12. The lower pivoting fin 12 is fixedly mounted to the upper stationary mounting portion 18. The pivoting mechanism 16 comprises an upper 20 and lower plate 32 which are rotably connected 52 to each other and includes a cavity 34 in the upper plate 20 where pins 24 from the lower plate 32 are projected to prevent movement beyond a few degrees. An alternative embodiment discloses a different form of limited pivoting mechanism 54 when the mechanism is mounted directly into the surfboard 10.