FCS II Reactor Review

9.5/ 10 Estimated score

9.5

Estimated from 1 independent sources (no numeric scores published)

Average price$134Range $134–$134 across 2 retailersSee sources

The FCS II Reactor is the neutral, all-round template designed for lighter, more compact surfers. Slightly smaller base and depth than the Performer, with the same balance of speed, flow and control — the reference default fin for surfers under 70 kg.

View on FCS

Quick specs

System: FCS II
Type: Thruster (3-fin)
Flex: Neutral (Performance Core)
Foil: Flat inside foil (side) / cambered (centre)
Rider size: Small (52–70 kg) / Medium (65–80 kg)
Best for: Lighter surfers wanting an all-round thruster feel

The Reactor is FCS's answer to a common problem: the Performer template scales beautifully for medium and larger surfers, but riders under about 70 kg can find it slightly draggy. The Reactor is that same neutral template with a smaller base and depth — same feel, right proportions.

It is the recommended default fin for smaller-framed surfers, groms progressing off soft-tops, and anyone in the 52–70 kg range shopping an FCS II board that shipped with generic fins.

Pros & cons

The Performer's balance of speed and control, sized for lighter surfers
Works across everyday shortboards, grovelers and hybrids
Softer feel than the Carver — more forgiving in average surf
Widely stocked in FCS II boxes worldwide

Overlaps with the Performer for medium-weight riders — pick one
Not the fin for heavier surfers or bigger, faster waves (go Performer L or Carver)
White Edition finish only in PC construction on FCS.com

How it surfs

FCS's own product copy positions the Reactor as "the ideal fin for the lighter framed surfer looking for a versatile and forgiving fin" — a positioning consistently echoed on retailer sizing charts (Boardcave, Cleanline Surf, Real Watersports).

The White Edition (2026 stock finish) is the current version on FCS.com. Older black/coloured Reactor PC sets from 2019–2023 are functionally identical.

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
Small	Base 4.16" / Depth 4.35"	52–70 kg	All
Medium	Base 4.31" / Depth 4.48"	65–80 kg	All

How it compares

Board	Best at	Wave range	Aggregate score
FCS II Reactor	Neutral, lighter riders	Waist to overhead	9.5
FCS II Performer	Neutral all-round	Waist to overhead	9.8
FCS II Carver	Drive-oriented	Bigger, cleaner surf	9.8

Verdict

The Performer template, sized for lighter surfers. The correct default fin for anyone in the 52–70 kg range riding an FCS II board.

Estimated score: 9.5 / 10

Estimated from 1 independent sources — none publish numeric scores. See sources 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.

Estimated score

9.5/ 10

9.5

1 sources, none scored

Source	Score	Summary
Blink Surf — Reactor PC Tri Fins Review	No numeric score	"Designed for speed and tight turns, with added tail release. Upright template allows for tighter, more acute directional changes."

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

$134

$134–$134 · 2 retailers

Retailer	Price	vs. average
FCS	$134	—	Visit
Cleanline Surf	$134	—	Visit

Frequently asked questions

Reactor vs Performer — which should I get?+

Under 70 kg: Reactor. Over 70 kg: Performer. Both use the same neutral template — the difference is size, not character.

Is the Reactor a beginner fin?+

It's ideal for progressing intermediates and lighter frames. Absolute beginners on soft-tops don't need aftermarket fins yet.

Will Reactor fit a Futures box?+

No — FCS II only. The Futures analogue is the AM2 or an equivalent smaller-template thruster.