Power Side Bites Fins Set - ST Box

For whom?

The Power is aimed at surfers looking for a good balance between responsiveness and control. It suits an intermediate level. It works in a wide range of conditions. This is a versatile and high-performance side bite.

What for?

It works particularly well on modern longboards, mid-lengths or performance-oriented boards. In fast or slightly hollow waves, it provides the necessary control to surf more vertically without losing flow.

Mounted in a 2+1 setup, it transforms the board’s behaviour, making it more dynamic, more precise and more committed. It allows you to attack sections with confidence, push harder through turns and link manoeuvres smoothly. It brings the setup closer to a thruster-like feel while retaining the glide of a single fin dominant configuration. A very balanced option for modern yet accessible surfing.

What size?

In a 2+1 setup, the center fin and side bites work together. Their relative size directly determines the balance between glide, stability and manoeuvrability.

The center fin remains the dominant element of the setup: it defines the line, stability and overall behaviour of the board. The side bites complement this by adding grip when the board is on rail, allowing deeper engagement in turns.

The balance between these two elements is essential.

This guide focuses on two side bite sizes: 3.5” and 4”, the most common sizes covering all longboard and mid-length uses.

3.5” side bites remain discreet. They preserve a single-fin-like behaviour, with lots of glide, long lines and a very fluid board. In contrast, 4” side bites add more grip and responsiveness. The board becomes more dynamic, easier to turn and more modern in behaviour.

The fundamental rule remains simple:

The larger the side bites, the smaller the center fin should be.

And conversely, the smaller the side bites, the larger the center fin can be.

However, in practice there is an important limit: once the center fin exceeds 6.5”, only 3.5” side bites are recommended.

Why?

Because a large center fin already generates significant control and stability. Adding oversized side bites would unbalance the setup, making the board too stiff, less fluid and less enjoyable to surf.

Thus:

• a center fin of 7”, 7.5”, 8” works ideally with 3.5” side bites
• 4” side bites are reserved for smaller center fins, generally 6.5” or less, to add dynamism without excess.

When the center fin is large and side bites are small, the board behaves closer to a single fin: smooth glide, stable line and wider turns. This setup is ideal for semi-retro longboards, soft waves and noseriding.

Conversely, when the center fin is smaller and paired with 4” side bites, the board becomes more responsive. Rail-to-rail transitions are faster, turns are tighter and surfing feels more modern. This setup suits modern longboards, mid-lengths and faster waves.

Finally, note that total fin surface should increase as board size increases. 

2+1 setup examples by board type

The set consists of two side fins (right and left).

It comes with a fin key for installation.

Delivery

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The delivery time, meaning the transit of the parcel to your address, then depends on the delivery location and the carrier.
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