FCS II Mayhem Pivot Quad Rear Fin Set - Sand (M)

Your new go-to template for low rockered fun boards and beach break fun.

Designed in collaboration with shaper and pro surfer Matt Biolos, the Mayhem Pivot Quad Rears are a refined high-performance template built for surfers who want speed, tight turns, and quick directional changes. Suitable for a wide range of boards—from elite high-performance models to versatile everyday boards like the RNF and Puddle Jumper—this fin emphasises agility and responsiveness, particularly on lower-rockered boards.

Part of the Reactor fin family, the Mayhem Pivot features smooth curves, a moderate tip area, and a neutral sweep angle, delivering a smooth feel while allowing for sharp snaps off the top and rapid turn redirection. Inspired by the Reactor template, it is designed for beach break conditions where speed and acute turning are essential.

The stealthy new aesthetic completes the signature design, pairing performance with style for surfers seeking a responsive, speed-oriented fin.

Features & Benefits

• Designed in collaboration with Matt Biolos
• Upright template for tight turns and quick directional changes
• Moderate tip area and neutral sweep for smooth, responsive feel
• Built for speed, snaps, and tail release
• Ideal for beach breaks and lower-rockered performance boards

Performance Feel

The Mayhem Pivot provides fast, responsive, and agile performance.

The upright template allows surfers to perform tight, acute turns with confidence, while the smooth curves and moderate tip ensure stability and control during high-speed maneuvers. This fin excels at generating drive through the pocket and quick redirection off the top, making it ideal for surfers who like to attack critical sections of the wave with speed and precision.

The result is a fin that feels lively, controlled, and highly responsive, perfect for performance-focused beach break sessions.

Fin Template: Reactor

Built for speed, tight turns, and explosive snaps.

The Reactor template features an upright outline with a smaller centre of area, allowing the board to pivot quickly and release cleanly off the top.

This makes it ideal fin for surfers who favour fast surfing, sharp turns, and progressive manoeuvres.

Ideal Conditions: Beach Break

Performs particularly well in:

• Hollow waves
• Fast, punchy beach breaks
• More critical surf conditions

Board Compatibility

• Designed to fit the FCS II Fin System.
• Recommended for performance shortboards with moderate-to-low rocker.

Performance Core 

Performance Core Carbon (PCC) combines the proven Performance Core construction with full-template carbon tissue reinforcement. Built using a multi-layered RTM process with a lightweight hex core, this trusted construction delivers progressive flex, drive and reliable performance across a wide range of conditions. Extending the carbon tissue across the full template adds controlled stiffness, particularly through the tip, complementing the fin’s more upright outline with faster rebound, sharper response and more positive feedback through tight turns and rapid direction changes.

• MEDIUM (65kg - 80kg / 145 - 175 Lbs)
• LARGE ( 75kg - 90kg / 165 - 200 Lbs)