K4 Incinerator Rears

FAQ

What are the K4 Incinerator Rears designed for?

The K4 Incinerator Rears are specially designed for modern quad-wave setups and offer plenty of speed, agility, and lightning-fast direction changes in the wave. They also work as a rear fin in a thruster setup and pair perfectly with the K4 Incinerator Fronts.

What sizes and boxes are available for the Incinerator Rears?

The Incinerator Rears are available in sizes 13.5, 14, 14.5, 15, 15.5, 16, 16.5, and 17 cm. You can choose between a US box and a SlotBox head (SB), with the SlotBox head also fitting into the new Starbox.

How do I choose the right size for the Incinerator Rears?

Due to the narrower chord width and smaller base width, K4 recommends choosing fins about 0.5 cm larger than your usual fin. This gives you the right amount of drive and hold without the fin looking too small.

What flex do the Incinerator Rears have, and how does it affect the riding experience?

The K4 Incinerator Rears are available in medium flex as well as a super-stiff (SS) version. Medium flex provides a lively, loose character, while the SS version offers more directness, acceleration, and drive—ideal if you want to loosen up a stiffer board or get maximum drive.

Which front fins can the Incinerator Rears be paired with?

The best combination is with the K4 Incinerator Fronts (8–11 cm, US/MT/Slot/Starbox). This creates a perfectly balanced quad setup with a fast, loose feel and secure grip in the bottom turn.

How are the Incinerator Rears mounted?

Depending on the head you choose, they are mounted in your US box or SlotBox/Starbox. Please note that K4 no longer includes the screw set with US-head fins as standard—check beforehand whether you already have the screw and plate.

How much does an Incinerator Rear fin weigh?

According to the manufacturer, a single Incinerator Rear weighs 0.090 kg. This keeps the setup light and agile at the back without adding unnecessary weight to the board.

How many fins are included?

The K4 Incinerator Rears are sold individually. For a complete quad setup, you will need two rears and two matching Incinerator Fronts.