Aether- Carbon Ultra-Light Tubeless Valves

Instead of CNC-machined aluminium, we use long carbon fiber-polymer composite injection. This allows for significantly lower density (around half that of aluminium) and greater design freedom for optimized internal geometry. The result is a valve that is not only lighter, but engineered differently from the ground up.

Despite weighing just 2.6g, AETHER’s long carbon fibre composite construction delivers exceptional structural strength - demonstrating that ultra-lightweight does not have to mean fragile.

To eliminate unnecessary mass, we moved away from the traditional removable Presta core.
Our design uses a bottom-sealing mechanism, inspired by early valve concepts from 1915's, where the sealing interface sits at the base rather than the top. This simplifies the internal structure and creates a more direct air path—without the typical restrictions of standard Presta cores.
Sealing elements remain rubber to ensure reliable, airtight performance.

While many modern valves focus on high-flow MTB designs, often adding bulk and cost, we prioritized what matters for road and gravel: Low weight, Compact form and Clean integration with modern rims. Reducing rotating mass at the wheel may seem like a small detail—but it’s exactly where weight matters most.

And MTB?
AETHER remains fully functional on MTB setups and retains the same advantages in simplified construction, direct airflow and reduced clogging. However, the performance benefit of reducing rotating wheel mass is naturally more noticeable on lightweight road and gravel wheel systems than on heavier MTB setups.

Tubeless valves operate in a harsh environment filled with latex particles, sealant residue and constant pressure fluctuations. AETHER was engineered around a simplified internal structure with fewer interfaces and fewer areas where sealant residue can accumulate over time.
By eliminating the traditional valve core entirely, AETHER creates a more direct airflow path while removing one of the most common sources of clogging and maintenance in modern tubeless systems.
The result is a valve designed to stay clear, inflate consistently and remain easy to live with long term.

AETHER shares a similar bottom-sealing concept with valves such as Fillmore, but differs significantly in internal execution.
During development, absoluteBLACK observed that many serviceable valve designs require additional internal retention features and interfaces which themselves can become accumulation points for dried sealant over time.
In other words, the very complexity required to make such valves serviceable can also create the need for periodic servicing in the first place.
AETHER was therefore engineered around a simplified internal structure with fewer interfaces and fewer areas where sealant residue can accumulate.

1. Can the AETHER valve open by itself while riding?
Answer: No. The valve remains securely sealed by tire pressure itself.
Unlike a traditional Presta valve, AETHER uses a bottom-mounted sealing mechanism with a relatively large sealing surface. Tire pressure continuously pushes the sealing plunger upward into the closed position. For the valve to open unintentionally, centrifugal force or impact force would need to overcome the air pressure keeping it sealed. Because the moving parts are extremely light, this would only become theoretically possible at speeds far beyond normal cycling conditions — well over 200 km/h even at low tire pressures.
The same applies to jumps and impacts. The forces required to unintentionally open the valve are significantly higher than what typical bicycle components experience during riding.

2. Is the carbon fiber composite strong enough for a valve?
Answer: Yes. The long carbon fiber-polymer composite used in AETHER valves has tensile and yield strength exceeding the 6061-T6 aluminium commonly used in many tubeless valves.
In addition, AETHER does not require internal threads for a removable valve core. This allows the valve tube walls to be thicker, further increasing strength and durability. While there is no industry-standard valve strength test, none of our team members have managed to break an AETHER valve by hand — and we have certainly tried.

3. Can I use mini electric pumps with AETHER valves?
Answer: Yes. We recommend using electric mini pumps with a hose attachment, as supplied with many portable inflators. In emergency situations, direct attachment to the valve is also fine up to 90 psi.

4. Can I inject sealant through the AETHER valve?
Answer: Yes. AETHER valves are designed with a direct, unrestricted airflow path that allows sealant injection. For easiest application, use the clear plastic tube supplied with many sealant bottles or a syringe with threaded tubing.

5. Can I use Aether valve without the supplied cap?
Answer: Yes. The cap is primarily designed to protect the valve tip from mud, dust, and debris, helping ensure easy inflation and long-term reliability. Just like protective caps used on Presta or Clik valves, it is recommended but not strictly required.

6. Is AETHER made from plastic?
Answer: No. AETHER is made from a long carbon fiber-polymer composite engineering material. Paradoxically, the tensile strength and yield strength of the long carbon fiber composite we use exceeds that of the 6061-T6 aluminum commonly used in many tubeless valves.
Carbon bicycle components such as frames, wheels, and cranks are also not made from “pure carbon.” They are composite structures where carbon fibers are bonded together with resin systems and thermally cured into complex high-strength parts. AETHER uses the same engineering principle, but with a material system that allows extremely precise injection molding of very complex lightweight structures. This lets us produce valve components with exceptionally low weight, high impact resistance, and strength exceeding many traditional aluminum valve designs.

7. If AETHER does not use a Presta core, how does it work?
Answer: AETHER uses an entirely different sealing concept from traditional Presta valves.
Instead of a Presta valve core at the top, AETHER seals at the bottom of the valve using a lightweight plunger mechanism positioned inside the rim cavity. When inflating, air pressure momentarily lifts the sealing plunger to allow airflow. Once inflation stops, tire pressure immediately pushes the plunger back into the sealed position. This design eliminates restrictive airflow paths, tiny threaded components, and common clogging points associated with traditional valve cores.

8. What is the difference between Clik valves and AETHER valves?
Answer: Both systems eliminate the small threaded locknut used in traditional Presta valves and improve ease of use.
Clik valves are conceptually closer to Schrader valves adapted to fit Presta-sized rim holes. Their main advantage is quick push-on pump attachment. AETHER valves use a completely different internal architecture. The sealing mechanism is positioned at the bottom of the valve and protected inside the rim cavity, with no spring-loaded core mechanism. This creates a more direct airflow path, reduces clogging risk, and enables extremely low weight while still allowing simple one-handed operation.

9. How is AETHER different from Fillmore or Peaty’s valves?
Answer: AETHER shares a similar general concept with Fillmore and Peaty’s valves, which themselves share similarities with early valve concept dating back to the 1915 US Patent 1,129,585. The idea of relocating the sealing mechanism away from a traditional Presta core is therefore not entirely new.
The key difference with AETHER is simplicity of execution. AETHER uses only two primary functional components: the valve tube itself and the rod-plunger sealing mechanism.
Rather than relying on multiple internal retention parts to prevent the plunger from falling out, AETHER secures the mechanism by slightly widening and flattening the tip of the rod so it cannot pass through the valve opening.
This allows for a much simpler internal structure, a more direct airflow path, lower overall weight, and fewer areas where tubeless sealant can accumulate or clog the valve. The result is a cleaner, lighter, and mechanically simpler system with fewer potential failure points.

10. Question: How is AETHER different from Barbieri Carbonaria valves?
Answer: Barbieri Carbonaria valves retain a traditional removable Presta core inside a composite valve tube. This requires both internal threading for the valve core and external threading for the locknut, resulting in relatively thin tube walls.
AETHER was engineered around a fundamentally different architecture. By eliminating the traditional Presta core entirely, the valve tube can use thicker wall sections, fewer internal interfaces and a more direct airflow path. In addition, AETHER uses a long carbon fiber composite material, where the fibers themselves contribute significantly to structural strength and durability.

11. Can Aether valve be used with tire inserts?
Answer: Yes. The bottom sealing mechanism is protected by two half-moon composite support elements that maintain airflow channels around the valve opening.
This allows air to flow freely even when a tire insert presses directly against the valve area.

12. Will sealant clog the AETHER valve?
Answer: AETHER was specifically designed to minimize clogging.
Traditional Presta valves use narrow internal passages and small moving core components that can easily become contaminated by sealant buildup.
AETHER uses a much more open internal airflow path with fewer restrictions and fewer internal parts. This allows sealant particles to pass through more freely and greatly reduces the likelihood of blockage.

13. Does AETHER improve airflow compared to traditional valves?
Answer: Yes. Removing the traditional Presta valve core creates a significantly less restrictive airflow path. This improves inflation efficiency, helps with faster tire seating, and allows more consistent airflow during setup and pressure adjustments.
The result is easier tubeless setup and more reliable day-to-day use.