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Silca Ultimate Tubeless Sealant


Regular price£21.00 Sale price

Silca Ultimate Tubeless Sealant


Regular price£21.00 Sale price
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Silca Ultimate Tubeless Sealant combines the power of carbon fibre with a long lasting natural latex formula to achieve sealing properties beyond that of special race day formulas, while matching or exceeding the life expectancy of long-lasting formulas.  

The key is a high percentage fill of recycled, chopped carbon fibre strands which are held in suspension by the foaming action of the sealant within the tire. Upon puncture, the sealant rushes to escape the hole, carrying thousands of carbon filaments which serve to dam up the opening, just like sticks of a beaver dam blocking a stream. This dam of fibre collects more fibre and what was one large hole, is now turned into hundreds of smaller holes for the sealant to seal.  

Fiberfoam technology has proven to seal up to 7.5mm holes and cuts at gravel pressures and up to 5mm holes at higher road pressures. Even better, the carbon fibre/latex plug formed at the puncture has proven to be more than twice as strong over time as latex only or latex with crystals or glitter.  

While most sealants claim they can plug holes up to 6+mm, they can also be injected into the tyre through the 3mm hole in your valve stem with some injectors using tips as small as 2mm. The power of carbon fibre makes this impossible, Silca Ultimate Tubeless Sealant will instantly plug your injection syringe or your valve as the fibres stack up to block the opening. In solving this issue, the Silca team has developed Ultimate Tubeless Sealant into a system that will save you time and money in the long run.  

The initial installation of Silca Ultimate Tubeless Sealant must be done by pouring into the tyre cavity rather than injecting through the valve. However, unlike other sealants which must be completely replaced every 3-6 months, Silca Ultimate Tubeless Sealant has a special Replenisher which can be pumped through the valve and can extend the sealant life to well over 1 year depending on your climate. This means less wasted sealant, and less hassle over time as there is no need to remove the old sealant at each service interval, in many cases, the sealant may outlast the tyre.

Please note that CO2 can be used initially to seat tyres, but should be removed as soon as possible and replaced with air in order to maximise the life of the sealant. 

Product Information

Unused sealed sachets should be stored inside the box in a well-ventilated, dry place and protected from moisture, heat and direct sunlight. Can be stored for up to 3 years.


Each sachet contains 30g powder.2 x 30g sachets per carton box.

Makes 2x litres of bike cleaner

100% plastic free packaging

Readily biodegradable ingredients

100% water free

Refill your old bottle and help reduce plastic waste 

92% saving in packaging compared to 2 x 1L bike cleaner

100% environmentally friendly ingredients, including plant based raw materials

Supplied in a compostable sachet and printed with vegetable inks

FSC recycled card box containing 2 x sachets – that makes 2L of bike cleaner 

Safe on all parts and surfaces including carbon fibre

Will not harm seals, cables, disc brake pads or rotors

Alkaline based and free from alcohol, CFCs, EDTA, solvents or acids

Vegan & vegetarian friendlyCruelty free, not tested on animals

Sachet Instructions

1. Grab your empty old bottle of Muc-Off. (You may need a pair of adjustable pliers to remove the trigger from the bottle). Or purchase our Bottle for Life.

2. Fill up to the shoulders of the bottle with 1 litre of lukewarm water for faster formula activation! 

3. Carefully cut one corner of the sachet open along the diagonal cut lines.

4. You can carefully pour the sachet straight into the top of the bottle. Or using the box, fold the inside of the lid together using the printed lines as a guide and use this as a funnel to pour the powder into your bottle. (Please see our video for full instructions on this. 

5. Screw your spray trigger back onto the top of the bottle. Ensure it’s tight!

6. Shake the bottle vigorously for 30-60 seconds to activate the formula. If you notice any undissolved powder simply keep shakin’ it! 

7. Go clean that filthy bike!

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