Tija de sillín unibody Gemini ÄLSAK de carbono, vista principal con acabado mate

€319,98 EUR

Select the length of your Gemini Älsak seatpost

Step 1 : Take a tape measure, measure the effective length of your seat post, between the seat clamp and the seat rails, as shown in the picture:

Step 2 : Using the effective length of your bike, identify in the following table within which range it falls, and what seat post length it corresponds:

Step 3 : Select the seat post length you need and place your order .

* We only produce a limited quantity each week.
If you order today, it will be ready in 2-3 weeks.

FREE EU Shipping

15 days for exchanges and returns

3-year warranty

TOP Customer Service, Contact Us!

By default, our handlebars come with a UD matte finish, offering a clean, minimalist aesthetic with a smooth black surface. For those seeking a more customized or eye-catching look, we offer optional finishes at an additional cost:

You shine
Glossy black finish on UD fiber.
Ideal for those who prefer a more polished and elegant aesthetic.
Keeps the surface smooth, with no visible pattern.
12K gloss
Glossy finish on 12K carbon fabric.
The interlaced pattern of the fiber remains visible, providing a distinctive, technical look.
Recommended for those who want to highlight the carbon character of the piece.
12K matte
Matte finish on 12K fiber.
Combines the visible pattern with a more discreet and professional aesthetic.
Perfect for those seeking a balance between sophistication and performance.

By default, all our seatposts come with the Lightweight layup, developed to offer the lowest possible weight without compromising aesthetics or functionality. For those seeking increased stiffness and efficiency with every pedal stroke, the Performance option is available, designed to maximize power transfer and structural strength.

- Lightweight (included by default)

Ultra-light laminate from 73 g in the 250 mm version and 27.2 diameter.
Optimized to minimize weight without sacrificing design or quality.
Ideal for cyclists obsessed with lightness and performance.
It maintains a clean and minimalist aesthetic, with high-end finishes.
Designed for cyclists up to 90 kg .
It is not designed to withstand strong impacts: it is a precision piece for those seeking extreme efficiency.

- Performance

Stiffer laminate, with an increase of 20–30 g compared to Lightweight.
Designed for cyclists who prioritize power transfer and resistance with every pedal stroke.
Improves structural rigidity, especially useful in intense efforts and demanding terrain.
Increases durability against impacts and falls.
Designed for riders up to 120 kg , offering greater safety without compromising performance.

ALSÄK is our ultra-light seatpost with a unique design.

Its body is conceived as a continuous carbon shell . This design allows the carbon fiber to work stretched throughout the entire geometry, achieving an extremely light and strong structure, while the mounting system is made of forged carbon . a cutting-edge material, and all the screws are made of Titanium , to lighten your bike as much as possible and make you feel like you're flying with it.

We handcraft each seatpost in our Barcelona workshop , using our own technology and the finest carbon fiber. That's why this seatpost is unique, an exclusive piece, with limited production, so you can reduce the weight of your bike with design and personality.

Available Carbon Laminate Configurations :
- Lightweight (default) : from 65 g, maximum lightness and comfort (maximum rider + bike weight of 90 kg)
- Performance : +35 g, increased rigidity, crash resistance, and power transmission. (maximum rider and bike weight: 130 kg)
Displacement:
- 0 mm.
Finish:
- Standard: UD fiber finish and matte lacquer (smooth black aesthetic)
- Customized (extra cost): UD fiber finish lacquered in gloss, 12K fiber lacquered in gloss or matte.
- Custom Lab (extra cost): Take your seatpost painting to the next level, contact us and make your seatpost unique!

While the products we create are worthy of a display case, they're meant to be enjoyed by you as you ride and push your limits, and falls are part of the game.
In this situation, if you damage a Gemini component, don't worry and send us an email to info@ridegemini.com with:

details and photos of your damaged product
your original receipt
any other details that may be useful

and we'll offer you a discount on a replacement component

Country:

ÄLSAK

Made with care and unconditionally loved by our customers.

Lightness, beauty and performance in one piece

Starting at 69.5 grams, one of the lightest seatposts in the world, with a careful design that makes it a unique piece.

Designed and handcrafted in Barcelona

We believe it's time for a change; that's why we make everything in-house, where Gemini artisans can ensure the excellence of every piece.

Super light but large surface area jaw base

To prevent shear stresses on the saddle rails, ÄLSAK has a large support surface in the cradle that will prevent them from being affected by insufficient support, especially the carbon fiber rails.

Super light but large surface area jaw base

To prevent shear stresses on the saddle rails, ÄLSAK has a large support surface in the cradle that will prevent them from being affected by insufficient support, especially the carbon fiber rails.

Titanium screws

The best demands the best: 100% titanium bolts and pivots, a TOP seat post with TOP materials.

Forged Carbon, Hypercar technology in your seat post

Innovation, even in the smallest parts, makes ÄLSAK unique and cutting-edge.

Applying more than 100 tons of pressure and temperature, to achieve maximum carbon strength and better fiber distribution throughout the jaw.

ÄLSAK

Made with care and unconditionally loved by our customers.

Tested to overcome the most critical forces

The resistance testing process is key during the development of the Carbon laminate, that's why we carry out all the tests in our own workshop, to ensure that the parts we design and manufacture are at another level.

Älsak FAQs

Yes, the different diameters of Älsak are designed according to the different seat tube standards. To find yours, check the inner diameter of your bike's seatpost housing and you'll know which Älsak diameter to choose.

Yes, our clamp system makes it fully compatible with any standard seat rail, from circular to oval.

Of course, you can choose from our 250, 300, 350, and 400 mm length options. For each length option, the clamping area is specifically positioned relative to its base, so the seatpost can only be mounted within the defined area. Therefore, if you want to shorten the length of the Älsak seatpost, you must select a STD option, as it is not possible to cut the tube.

The seatpost cannot be cut; the carbon layup is optimized for each length. You must choose the length that best suits your measurements and select that length when ordering.

Both options only determine the carbon fiber pattern of the last layer of the seatpost, while the internal structure is the same for all options, performing exactly the same under riding stress. The UD (unidirectional) pattern is a fiber arrangement where all carbon fibers are parallel to each other, in a single direction. On the other hand, a 12K pattern is a fiber arrangement in which the fibers are woven in groups, visually forming a grid pattern across the surface.

Both options only determine the finish of the last layer of lacquer on the seat post. A gloss finish is completely smooth and generates very defined light reflections, while a matte finish is characterized by a more textured finish, which makes the reflections on the surface much more diffuse.

The key to Älsak's incredible weight is its hollow monocoque body. Unlike most carbon fiber seatposts, the upper section, where the mechanism elements are mounted, is not a solid body, and the surfaces where the pivot elements rotate are not intersections of the tube, resulting in a highly controlled mounting surface, fully supported by a fiber structure positioned in the optimal distribution. This sophisticated structure allows us to design a material optimization to provide an extremely light and beautiful seatpost.

Of course, this isn't a standard size, but we can manufacture up to 500 mm in length. When placing your order, please let us know your needs in the comments section, and we'll contact you to discuss the details.