5.2" / 4.35" Big Boy Quad Fins – Black Pro Glass | FCS II Compatible (Set of 4)

High-area performance quad fin set engineered for powerful surfers, larger boards, and maximum drive with controlled release.

The 5.2" / 4.35" Big Boy Quad Fins are designed to deliver dependable hold, projection, and stability for surfers requiring increased surface area and control. Constructed from durable black Pro Glass, this quad set provides a direct, responsive feel suited to committed turns and higher-speed surfing.

The larger front fins generate strong drive through bottom turns, while the balanced rear fins maintain controlled release and directional stability. This configuration supports confident performance in everyday surf as well as more powerful conditions where additional fin area becomes essential.

Compatible with FCS II fin box systems, the set installs without tools while maintaining secure engagement for regular surf use.

Key Features

• Large-area quad template for enhanced hold and projection

• 5.2" front fins with 4.35" rear fins for balanced quad performance

• Black Pro Glass construction providing stiffness, durability, and direct response

• Drive-focused design suited to powerful turns and higher speeds

• Controlled rear-fin release to maintain manoeuvrability

• FCS II compatible base for secure, tool-free installation

• Set of four fins for complete quad configuration

Ideal For

• Heavier surfers or riders needing greater fin surface area

• Performance quads, step-ups, and boards with added volume or width

• Surf conditions requiring hold, drive, and stability at speed

• Beach breaks, points, and reefs where controlled projection is critical

Choose 5.2" / 4.35" Big Boy Quad Fins

• Increased fin area delivers confidence under pressure

• Balanced quad sizing maintains drive without excessive stiffness

• Pro Glass construction ensures consistent flex and durability

• Reliable everyday quad option for larger or more powerful surfing

Compatibility

Fits FCS II fin box systems.
Not manufactured by or affiliated with FCS.

Frequently Asked Questions

Who should use larger quad fins?
Surfers with higher body weight, larger boards, or powerful surfing styles benefit from increased fin surface area and hold.

How do quad rears affect performance?
Rear fins regulate release and stability. Balanced sizing maintains manoeuvrability while preserving drive.

Are these suitable for small waves?
They can be used in smaller surf, though their larger area is optimised for everyday to more powerful conditions.

Summary

The 5.2" / 4.35" Big Boy Quad Fins are a large-surface-area Pro Glass quad set built for drive, hold, and controlled release in performance quad surfboards. Designed for heavier surfers, larger boards, and stronger conditions, they provide dependable projection and stability with FCS II tool-free compatibility.

Click here to see The Quad Fin Setup Guide