Elite SDM V2 Carbon Mast Extension (U-Pin) 46
Race-Ready Performance. Effortless Rigging. Ultra-Stiff Carbon.
Power, Precision, and Speed
The Elite SDM V2 Carbon Extension is built for racers and high-wind freeriders who demand stiffness, strength, and fast tuning. With pre-preg carbon construction and a stainless steel base, it delivers direct power transfer and responsive handling – even under extreme load
Rig Faster, Rig Smarter
No more wrestling with your setup. The triple-pulley system creates an 8:1 mechanical advantage for easy downhauling, even on high-tension race sails. Add a one-hand sliding collar and barefoot-friendly base, and you’ve got a rigging experience that’s as smooth as your first reach.
Built for Demanding Conditions
- Pre-preg carbon for maximum stiffness, minimal weight
- Stainless steel base creates a solid, flex-free connection
- 3 pulleys deliver efficient, high-load downhauling
- Flat base for barefoot comfort
- Open-and-slide adjustment collar for quick changes
Available Size
- 32cm: 4–32 cm range | 0.59 kg
- 46cm: 4–46 cm range | 0.70 kg
Why Choose the Elite SDM Carbon Extension?
- Ultra-stiff for better acceleration and control
- Lightweight carbon keeps your rig responsive
- 8:1 pulley system handles race sail loads with ease
- Built for SDM masts and U-Pin base plates
- Ideal for racers, freeracers, and high-wind performance sailors
- Mast compatibility : SDM
- Wall Thickness : 3 mm
- Max Insertion :
- Downhaul Ration : 8:1 - 3 pulleys
- Extension range : 4 - 46 cm
- Pulley angle : 0 Degrees
- Pulley diameter :15 mm
- Dyneema 4.0mm
- Rope compatibility :3.8mm - 4.0mm
- Rinse your extension thoroughly after each use to remove corrosive salt and abrasive sand.
- Keep sliding components clean and sand-free to prevent wear.
- Replace your downhaul line at least once per season and apply silicone lubricant to cleats for better grip.
- Before hitting the water, always inspect for cracks, corrosion, or worn components like pulleys and pins.
- Store your extension completely dry in a protective bag away from UV exposure, and never leave it inside the mast during storage to prevent corrosion.
What does features 1 year unconditional + 1-year conditional warranty cover ?
At Unifiber, we're confident in the quality of our gear and stand behind everything we make.
Here's how our warranty works:
- First year: Your product is completely covered - simple as that. We've got your back so you can focus on enjoying your time on the water.
- Second year: We continue to support you against any manufacturing defects because we believe in building gear that lasts.
- To make things hassle-free, just keep your proof of purchase handy when you need us., we're confident in the quality of our gear and stand behind everything we make.
Learn More
Choosing the right windsurf mast extension can make a big difference in your rigging experience and overall performance on the water.
From pulley systems to downhaul ratios, every detail plays a role in ease of use and durability.
In this FAQ, we’ll answer the most common questions to help you find the perfect extension for your setup.
1. What type of rope should I use for a boom or mast base extension?
- It’s best to use Dyneema or Spectra rope, as they are highly durable and have low stretch. A diameter of 4–5 mm is ideal to minimize friction while ensuring a good grip.
2. What do I need to know about mast extension insertion length?
- Because of the tapered shape of an SDM mast, there's a limit to how far one can insert the mast extension. This value relates to the total length of your extension tube, not to confuse with the range settings.
- A maximum 45 cm insertion length means that most 32cm mast extensions can be fully inserted into the mast. A maximum 60 cm insertion length means that most 46cm mast extension can be fully inserted.
- In case a non Unifiber brand extension does not fit, as an alternative solution the mast extension end cap can be removed without problem.
3. What is the downhaul ratio?
- The downhaul ratio refers to the mechanical advantage provided by the pulley system.
- For example, a 3:1 system means that for every unit of force applied, the tension on the sail is multiplied by three. Modern extensions often have 4:1 or even 6:1 systems, making downhauling easier with less effort.
4. Why is the pulley angle important?
The pulley alignment affects how easy it is to downhaul the sail. Proper alignment between the extension’s pulleys and the sail’s pulleys reduces friction and makes rigging easier. If the pulleys are misaligned, the rope can wear out faster, and downhauling becomes more difficult.
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