Elite SDM V2 Stainless Steel Mast Extension (U-Pin) 32
Full throttle. Zero compromise.
Elite SDM V2 Stainless Steel Extension – Built to race.
When every second counts and every gust tests your limits, you need gear that delivers – no excuses. That’s why we created the Elite SDM V2 Stainless Steel Extension. It’s the no-compromise choice for performance sailors chasing podiums, max speed, and flawless rig tension every single time.
Engineered with a high-efficiency 3-pulley system, this beast gives you an 8:1 downhaul ratio – so you can tension race sails with precision, power, and way less effort. No more wrestling with your rig on the beach. Just click in, haul down, and go.
The heart of this extension is all about strength. A direct, solid connection between the hardened T6 aluminium tube and marine-grade stainless steel base keeps everything locked in – even when you’re flying down the course or hammering through chop. No flex. No fuss. Just full control.
You’ll love the feel too. The smooth, flat base is easy on bare feet, and the one-handed adjustment collar means tuning between heats is as easy as twist, slide, click. Every detail is made to keep you flowing through sessions – not fighting your setup.
Why riders love the Elite SDM V2:
- Ultra-efficient 8:1 pulley system – tension big sails with ease
- Solid aluminium-to-steel connection – max stiffness, zero slop
- One-handed collar – fast size changes, even mid-session
- Flat base for barefoot rigging comfort
- Built to handle serious loads in all conditions
Whether you’re racing the fleet or chasing your own limits, this is the extension that shows up every time – strong, smart, and race-ready.
Let the wind do the work. You just hold the line.
- Mast compatibility : SDM
- Wall Thickness : 2.5 mm
- Max Insertion :
- Downhaul Ration : 8:1 - 3 pulleys
- Extension range : 4 - 32 cm
- Pulley angle : 0 Degrees
- Pulley diameter :15 mm
- Dyneema 4.0mm
- Rope compatibility :3.8mm - 4.0m
- 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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