FCS II Split Keel Quad Specialty quad keel fin set (FCS II) — full deck view

Photo: FCS II Split Keel Quad product page

FCS

FCS · Specialty quad keel fin set (FCS II)

FCS II Split Keel Quad Review

10.0/ 10 Aggregate score

10.0

Average price$190Range $190–$190 across 1 retailersSee sources

The FCS II Split Keel Quad splits a traditional keel into a four-fin set. FCS describes it as a high area specialty quad that adds bite and control to wide-tailed boards without giving up pivot.

View on FCS

Quick specs

Type: Specialty quad keel fin set
Fin system: FCS II
Material: Performance Glass
Size: Large to Extra Large, one size suits all
Template: Upright keel designed for traditional fish shapes
Recommended boards: Modern fish and hybrids with moderate to low rocker

FCS is direct about the purpose here. The official listing calls the Split Keel a high area quad keel set that adds bite and control to hybrid boards with wide tails without sacrificing pivoting capability, and recommends it for all board types including modern fish and hybrid models with moderate to low rocker.

Material and sizing are both simple. The set is Performance Glass, machine cut from layers of solid fibreglass, which FCS describes as stiff and used by pro-level surfers because the flex holds under force. Sizing follows the revised specialty range and is offered as one Large to Extra Large option rather than a weight-based run.

The rating shown is the FCS store average of 5.0 out of 5 from six reviews, converted to 10 out of 10 for the scale used across this site. Six reviews is a thin sample, so treat the figure as a signal from owners rather than a broad consensus.

Pros & cons

FCS lists a perfect 5.0 out of 5 across six verified store reviews
High area keel outline adds hold on wide tails that lose bite in steeper waves
Splitting the keel keeps pivot that a single large keel gives up
Performance Glass holds its flex under load, which suits drawn-out keel turns

$190 is at the top of the FCS specialty range
One size only, so there is no adjustment for rider weight
Designed around fish and hybrid outlines rather than performance thrusters
Six reviews is a small sample for a published average

How it surfs

Split keels solve a specific complaint. A single keel per side gives drive and a long arcing turn, but riders often want more grip when the wave stands up. Cutting that area into two fins keeps most of the drive while letting the board turn on a tighter radius, which is why these sets suit modern fish with more curve than a 1970s outline.

Board choice decides whether this is the right buy. On a wide-tailed hybrid or a keel fish, the extra area is useful. On a performance shortboard the same area feels heavy, and a thruster set from the FCS II Performer or Reactor families is a better match.

Volume & sizing chart

Use the chart below as a starting point. Add half a litre if you are less experienced, subtract half a litre for a looser feel.

Size	Volume	Rider weight	Best for
Large to Extra Large	Performance Glass	One size suits all per FCS	All levels

How it compares

Board	Best at	Wave range	Aggregate score
FCS II Modern Keel	Classic twin keel drive	Fish outlines	8.9
Futures Controller Quad	Split keel quad rival	Wide tails	8.8
FCS II Power Twin + Stabiliser	Twin plus one control	Fish and twins	8.8

Verdict

A specialist set with a clear job: keep keel drive on a wide-tailed board while regaining pivot. The verified $190 price and 5.0 out of 5 store rating back it, though six reviews is a small base.

Aggregate score: 10.0 / 10

Aggregated from 2 independent sources — see full list below.

What reviewers around the web are saying

Surfex does not test gear directly. Below are independent retailer and editorial sources. When a source publishes a numeric score, it is normalized to a five-point scale; otherwise the source is listed without a score.

Aggregate score

10.0/ 10

10.0

2 sources

Source	Score	Summary
FCS official product page	10.0 5.0 / 10	"The FCS US store rates the Split Keel Quad 5.0 out of 5 based on 6 reviews, listing it at $190 in Performance Glass with a Large to Extra Large one-size fitment."
FCS fin type guidance	No numeric score	"FCS groups keels and specialty quads separately from thruster families and directs riders to match template area to board outline."

Where to buy & average price

Listed prices come from verified retailer pages. The average price below is an unweighted mean of verified retailer prices — converted to USD (≈) when retailers list in different currencies. Click any retailer to verify the native-currency price.

Average price

$190

$190–$190 · 1 retailers

Retailer	Price	vs. average
FCS US	$190	—	Visit

Frequently asked questions

What is the FCS II Split Keel Quad designed for?+

FCS describes it as a high area specialty quad keel set that adds bite and control to hybrid boards with wide tails without sacrificing pivot. It is recommended for modern fish and hybrids with moderate to low rocker.

How much do the FCS II Split Keel Quad fins cost?+

The FCS US store lists the set at $190.00 in Performance Glass.

What sizes are available?+

The set is offered as one Large to Extra Large size. FCS notes that its specialty fin range uses this simplified sizing rather than a weight-based run.

How is the Split Keel rated by owners?+

The FCS US product page shows 5.0 out of 5 based on 6 reviews, which converts to 10 out of 10 on the scale used here. The sample size is small.

Split Keel Quad or Modern Keel twin?+

Choose the twin keel for classic drive and long arcing turns. Choose the Split Keel Quad when you want that area broken up for a tighter turn radius and more hold as the wave steepens.

Will these fins work on a shortboard?+

They fit any FCS II board, but the high area suits fish and wide-tailed hybrids. On a performance shortboard a thruster template such as the Performer or Reactor is a better match.