A good choice for tubeless riders who want long service life, valve injection and enhanced puncture-sealing material in one maintenance-friendly formula.
Silca Ultimate Tubeless Sealant is a premium tubeless tyre sealant for road, gravel and mountain bike setups. Its natural and synthetic latex blend stays liquid for longer, while optimised carbon fibre strands reinforce the seal formed at a puncture. Advanced foaming agents help carry those strands through the tyre to the damaged area, supporting the claimed ability to seal 6 mm+ punctures.
The 500 ml bottle is injectable through the valve, so refreshing your tyres can be cleaner and quicker than removing the bead. You’ll need a separate injector, and the sealant is not injectable through Reserve valves; valves designed for tyre inserts may also have narrower internal openings. The ammonia-free formula is tested to seal down to -15°C, and longer-term testing of the updated formula found it remained fluid for more than five months and washed out easily. Puncture sealing is not guaranteed every time, so we recommend carrying a tubeless plug kit on rides where getting home matters.
Seals 6 mm+ punctures
Optimised carbon fibre strands reinforce the latex seal to help close larger punctures.
6+ month service life
The revised latex blend is designed to remain liquid in the tyre for longer between top-ups.
Injectable through the valve
Refresh your sealant without removing the tyre bead, using the separately sold injector.
Natural and synthetic latex blend
A one-step formulation delivers sealing performance without the former two-step process.
Advanced foaming system
Foaming agents help distribute the carbon fibre strands through the tyre and towards a puncture.
Ammonia-free formula
A practical choice for riders looking for sealant without ammonia in the formulation.
Cold-weather performance
Tested to seal punctures at temperatures down to -15°C.
Easy clean-up
Long-term testing found the updated formula washed out of the tyre without leaving dried residue or staining.
General
Materials & construction
Performance
Compatibility & installation
Warranty
Natural and synthetic latex blend
The one-step latex blend stays liquid for longer while delivering dependable puncture sealing without the former two-step process.
Optimised carbon fibre strands
Carbon fibre strands reinforce the seal formed at a puncture, helping the sealant close larger holes.
Advanced foaming agents
The foaming system carries the carbon fibre strands through the tyre to the puncture for effective sealing.
Relentlessly pursuing perfection.
Silca is a cycling equipment brand founded by Felice Sacchi near Milan, Italy, in 1917. Its history includes innovations such as putting gauges on pumps, developing a high-pressure frame pump and introducing a valve-controlled CO₂ inflator. The brand is known for combining traditional craftsmanship with durable materials and product innovation.
In 2013, ownership transferred to Joshua Poertner, and Silca’s headquarters and manufacturing moved to Indianapolis, Indiana, in 2014. The company produces pumps, tools and cycling accessories, with an emphasis on design, strength, durability and long service life.
