SILCA Tubeless valve stems are designed to strike a balance between weight, strength, airflow and ease of installation. We started this project out of our own frustration at the two extremes of product in the market: inexpensive, heavy brass valve stems or uber-lightweight aluminium stems that had reputations for being problematic in the field. In classic SILCA fashion, we set out to understand the issues and develop a better solution.
For SILCA Tubeless Valve Stems, we've chosen to keep the geometry of the finest brass valve stems, while producing them from the finest cold drawn aluminium bar rather than a hollow extruded bar. This process is less cost-effective than extrusion but allows for a higher material yield strength and more accurately machined parts. As a result, our valves weigh less than half of brass valve stems, yet are 50-200% stronger than common lightweight aluminium valve stems.
We've paired these valves with the finest, fully CNC machined valve cores you can buy. Just looking at them, you can see the quality, from the fully machined brass pin with roll formed thread to the spin-formed ridge (instead of crimped) that keeps the valve nut from unthreading too far. The fully machined design leaves more internal space within these valves allows for better airflow as well as making them more tolerant of sealant.
Perhaps the most exciting feature of the SILCA tubeless program is the Speed Shield. Speed Shield grew out of our frustration with valve stem nuts scratching our rims...particularly our carbon rims! The concept grew out of an initial study we did on ways of improving aerodynamics around the valve stem, which proved out that 'shielding' the valve stem could save about 0.15-0.20 watts of energy per 10mm of valve stem encased in the shield. Of course, you cannot shield the whole stem, but we looked at this a second time in regards to tubeless and found that shielding the lower 10mm of the stem AND the nut resulted in even greater savings, 0.2-0.3 Watts per wheel at 30mph. Each Speed Shield contains a spherical recess to hold the valve stem nut, and the high durometer, high strength silicone is optimized to ensure the valve stem maintains optimal tension within the rim so that it remains sealed, but also ensures there are no bending loads in the stem which are the cause of so many failures in aluminum stems.
The highest quality Tubeless Valve stems with SpeedShield Rim Protectors for reduced weight, improved aerodynamics and more robust tubeless conversions, especially with carbon and deep section wheels.
- Less than half the weight of brass valve stems
- 50-200% Stronger than typical aluminium valve stems
- Ultimate level, fully machined brass valve cores with improved airflow
- SpeedShield Improves wheel aerodynamics while protecting carbon rims
- Spherical nut eliminates bending forces on valve stem for improved strength
- Available 44, 60, 80, and 100mm lengths
- Kit contains 2 Valve Stems, 2 Spherical Valve Nuts and 2 SpeedShield Rim Protectors
Few brands have been more intimately connected to the last 100 years of cycling than Silca. The Italian-born brand's legacy of legendary quality has seen company's pumps being passed down through generations of professional mechanics and cycling enthusiasts - riders who value the experience of bike maintenance and understand its performance value. Now based in the US, Silca's heirloom quality pumps have been joined by a growing selection of thoughtfully designed tools and stylish accessories. Read more about Silca.
Founded by real cycling enthusiasts in 2004, our passion for elite performance runs through everything we do at Saddleback. Our team of dedicated roadies, mountain bikers and triathletes practice what we preach to bring you the finest cycling products and a superior service to match. We're the official UK home of 3T, Alchemy, Castelli, Chris King, ENVE, Intense, Sidi, Silca, Stages and Troy Lee Designs.