FCS Knubster Centre Keel

Rated 4.7 out of 5
3 Reviews

Can be added to any quad set-up. Increase drive and provide directional control through turns.

  • Overview

    • Developed by Sean Mattison for Von Sol surfboards, the FCS VS KNUBSTER is essentially a centre fin that can be added to any quad set-up
    • The fin will increase drive and provide directional control through turns, without sacrificing speed, flow, or the freedom of movement typically associated with a quad.

    • The “KNUBSTER” is designed with a single tab that allows the fin to be positioned in the forward and rear centre plug to cater for the individual drive requirements of each surfer.

    Ideal Conditions

    • A wide range of conditions from beach breaks to point breaks.

    Board Types

    • All board types.
    • Will fit the FCS II Fin System when used with grub screws and the FCS Infill Kit.
  • Thermo Polymer


  • X-SMALL (Under 55Kg / 120 Lbs)
    SMALL (55Kg - 70Kg / 120 - 155 Lbs)
    MEDIUM (65Kg - 80Kg / 145 - 175 Lbs)
    LARGE (75Kg - 90Kg / 165 - 200 Lbs)
    X-LARGE (Over 85Kg / 190 Lbs)

  • We offer:

    • Express Shipping: Select Express 2nd Day Shipping at the Checkout for an additional fee of $4.95.
    • Tracking: Quick & easy online tracking. 
    • Peace of Mind: All our deliveries are fully insured against damage.
    • Returns: 30 day exchange or refund for unopened items.


    average rating 4.7 out of 5
    Based on 3 reviews
    • 5 Stars
      2 Reviews
    • 4 Stars
      1 Review
    • 3 Stars
      0 Reviews
    • 2 Stars
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    • 1 Star
      0 Reviews
    100% of reviewers would recommend this product to a friend
    3 Reviews
    Rated 5 out of 5
    Review posted

    Trailer fin

    This little fin is rad! Super stocked on the stability it gives when riding a twin fin! Overall sick product!

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    Rated 4 out of 5
    Review posted

    The Knubster makes a difference

    This fin has done exactly what I had hoped it would, and what it is advertised to do. Great! I have two boards it gets used on. A large 7' fish-style with a four fin setup which just needed that little extra drive and stability from a small centre fin. Perfect. And a 6'6" high volume board that basically wants to be a twin fin but slides too much without a centre fin. The knubster only gets used on this board in small wave conditions, and again works a treat.

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    Rated 5 out of 5
    Review posted


    I’ve had knubster fins as a stabilisater in a few surf boards. They give a hint of stability without effecting the turning ability. I am using them in conjunction with fcs modern keel . It’s a good combination

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