FCS II Mayhem Tri Fins

Designed by revered shaper Matt "Mayhem" Biolos. Same proven template with a new look.

Rated 4.9 out of 5
Based on 16 reviews
Product In Stock
  • Overview

    • The MB template offers freedom to perform tight turns in the pocket with an emphasis on speed.
    • Sitting in the reactor family, the MB is considered a high performance fin because it responds incredibly fast, but still offers enough control so you can confidently lay into a turn with plenty of force.

    Ideal Conditions

    • A wide range of conditions, particularly good in critical overhead waves.

    Board Types

    • Designed to fit the FCS II Fin System.
    • Performance shortboards and hybrid models.

    Fin Family

    • Reactor: Find Speed. Speed, tight turns & snaps.

  • Performance Core Carbon

    Often referred to as PC Carbon or PCC, these fins are highly responsive and feature strategically placed carbon that’s designed to complement the fin template. PCC fins suit fast surfing and are favored by power surfers who like to perform explosive turns on critical parts of the wave.


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

     Fin

    Base (inches)

    Base (mm)

    Depth (inches)

    Depth (mm)

    Area (inches)

    Area  (mm)

    Sweep Deg°

    Foil

    SML  4.19 106.3 4.46 113.2 13.71
    8847 32.0° Flat
    MED 4.30
    109.2 4.59
    116.4 14.49
    9347 31.7° Flat
    LRG 4.41 111.9 4.74 120.3 15.26 9847 32.9° Flat

    View the FCS Fin Data page for Base/Depth/Area/Foil information.



    • average rating 4.9 out of 5
      Based on 16 reviews
      • 5 Stars
        14 Reviews
      • 4 Stars
        2 Reviews
      • 3 Stars
        0 Reviews
      • 2 Stars
        0 Reviews
      • 1 Star
        0 Reviews
      100% of reviewers would recommend this product to a friend
      Customer photos and videos
      16 Reviews
      Reviewed by David S.
      Verified Buyer
      I recommend this product
      Rated 5 out of 5
      Review posted

      Favorite fin

      This is my favorite template, literally does everything in all conditions really well. I’ve never second guessed them from NY beachbreaks to Central America to Indo. 10/10

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      Reviewed by JOSE CARLOS CUERVO H.
      Verified Buyer
      I recommend this product
      Rated 5 out of 5
      Review posted

      Perfect all-rounder fins

      The FCS II Matt Biolos Tri Fins are the perfect all-rounder fins, delivering a superb balance of drive, hold and manoeuvrability. As an added bonus, these fins have the wow factor and are insanely cool.

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      Reviewed by Ollie W., from Australia
      Verified Buyer
      I recommend this product
      Surfing Ability
      Experienced
      Board Type
      • Funboard
      • Performance
      Rated 5 out of 5
      Review posted

      Well rounded, reliable.

      These are great. They’re fast, react well but are quite well rounded. I feel I can put them in any of my boards and they’ll perform.

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      Reviewed by Peter W., from Australia
      Verified Buyer
      I recommend this product
      Surfing Ability
      Experienced
      Board Type
      • Performance
      Rated 5 out of 5
      Review posted

      MB fins

      Love them good all round fin

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      Reviewed by Julio M., from United States
      Verified Buyer
      I recommend this product
      Surfing Ability
      Intermediate +
      Board Type
      • Performance
      Rated 5 out of 5
      Review posted

      Fun review

      Not to crazy about the graphics on the fins . So far the fins have impressed. Some good south swells will seal the deal I’m sure . Glad I purchased a set .

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