Seals more holes than most sealants
Does a great job on small goat head stickers and even seals larger rock tears.
• Effective down to 10F/ -12C
• Seals 7.5mm holes for up to 6mo
• Must be poured into tire during install
• Not injector compatible (It seals holes bigger than
your valve)
• Use Replenisher every 90-120 days for best
performance
• 6, 9, and 12mm recycled carbon fibers are dispersed evenly by a foaming latex to create ultra strong seals
• CO2 can be used to seat tires but should be removed as soon as possible and replaced with air to preserve life of sealant
• Made in the USA
Parts covered by SILCA Limited Warranty are considered to be subject to wear through normal use or are consumable subject to degradation through the course of their daily use. SILCA guarantees them free from manufacturer defects for 2 years.
SILCA Ultimate Tubeless Sealant uses the power of a foaming latex formula combined with chopped carbon fibers to boost sealing power even at higher pressures. Ultimate Tubeless Sealant contains 5% by volume, 6, 9, and 12mm chopped carbon fibers which have been reclaimed from recycled bicycles, carbon wheels, racecars, and aircraft components. A unique foaming latex formula allows for the very lightweight carbon fibers to be evenly dispersed within the sealant while riding, which allows for a higher fiber content than possible with Kevlar or fiberglass. At this high fiber loading, bundles of carbon fiber are carried directly to the puncture by the sealant flow where thousands of micro-bubbles collapse on each other, depositing their high stiffness carbon fibers over the hole. During this process, the carbon fibers form a dam of fibers against the tire casing not unlike a beaver dam of sticks blocking the flow of a stream. This dam of high stiffness/high strength fibers has been shown to seal holes in testing up to 7.5mm, some 25% larger than conventional technologies.
After the puncture is sealed, that area of the tire is left with a zone of carbon fiber reinforced latex bridging the top and bottom of the hole, helping to reduce the likelihood of future punctures in that area when compared to other sealant additives such as cornmeal, glitter, or fiberglass.
This superior sealing ability and hole reinforcing ability of the carbon fiber also allows for a higher concentration of anti-freeze agents in the sealant which means more effective sealing at low temperatures (6mm holes seal at 18deg F/ -7deg C), as well as longer lasting sealant (7-9months depending on humidity).
We recommend adding replenisher every 90-120 days depending on temperature and humidity where you live (see chart) to rejuvenate the sealant. Replenisher can also be used to replenish sealant on very porous tires during initial install. Some casing tires are very porous and will experience weeping of sealant throughout the casing sidewalls. Testing shows that weeping sidewalls can reduce sealant volume by 30% during the install, while also accelerating the aging of the sealant. Adding 30-50% of sealant volume back with the replenisher can ensure optimum performance and maximum life.
CO2 can be used temporarily to seat the tire, but should then be released and replaced with the floor pump to preserve the life of the sealant.
For best results we recommend using Tensilyzed Polypropylene (TPP) rim tapes such as those sold by Stan's, Joe's, 3M, Tessa, and others. These are generally opaque tapes without printing on them and are much stronger and more abrasion resistant than vinyl based tapes.
Does a great job on small goat head stickers and even seals larger rock tears.
Silca Tubeless Sealant lives up to it's reputation. The first sealant that stops worrying about a flat on the road (roadbike, 28mm).
My only concern is the thickness of the substance. I notice that pumping air into the valve is way more difficult than normally. It seems to clog a lot.
I honestly hate Silca ultimate sealant. The main feature of not pouring that through the valve is so painful to overcome in certain combinations of Tyre with a rim that ruins the whole experience. The next feature - "fiberfoam" foam part is working well, but hyped fibers are not working as intended. After initial setup, they are collecting mostly at the connection rim/tyre, due to that this is not differentiating this sealant from any other foaming agent.... in some cases polymers that you can add to the sealant are working better with sealing punctures. Carbon fibers in Silca sealant are really great with the clogging valve stem and valve core but do not help much with sealing punctures. After a few months of use, there is no difference if you would use replenisher alone as a sealant. As last - bottle alone - cap after closing the bottle broke... quality should be better...
Does the job!
Seals very well, even bigger holes!