Very very good
I had a few issues but it turns out ot was the dodgy preinstalled rim tape, albeit the sealant held it firm for a little bit. Touch wood, since sorting we haven't had any problems and i even noticed one puncture that has sealed!
• 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.
I had a few issues but it turns out ot was the dodgy preinstalled rim tape, albeit the sealant held it firm for a little bit. Touch wood, since sorting we haven't had any problems and i even noticed one puncture that has sealed!
When Orange Seal, Stans, Muc-Off won’t seal, Silca will! One example was a brand new tire on a brand new factory DT Swiss taped rim, leaked with Orange Seal. More than likely a porous tire, but I poured Silca in and it held great, probably because of the foaming properties. Every tire I’ve poured Silca in has sealed and I’ve never had a flat all season when in the past I’ve had leaks with other sealants. Yes it sucks that you have to pour the sealant in before completely mounting the tire and the presta valve guts gum up frequently, but it’s a small price to pay. Pro trick is to file off the mushroomed brass head on the presta valve so you can unscrew the nut off and disassemble and clean the dried sealant off. What’s great about Silca too is all you have to do is top off with replenisher through the valve rather than using the original and having to pour it in the tire or adding to the media particles like with other sealants. I’ve even seen this stuff seal up when the rim tape pulled away from the rim. This is a set it and forget it type of sealant!
Man does this stuff plug a hole. Works great.
Works better on my tubeless road tires than any other sealant I've ever used! Multiple 'goat heads', nails or tacks don't leak enough air to be noticed on hours-long rides.
I was quite critical of the initial batches of the Silca ultimate tubeless sealant because like quite a few other users, the carbon fiber pieces eventually formed several large clumps of carbon fiber balls. In August last year, I thoroughly cleaned my Schwalbe Pro One TLE tire and Enve 4.5 AR rim before mounting the tire on the rim. I added about 2 oz of the Silca sealant with Fiberfoam. In early November, I injected about 1 oz of the Silca sealant replenisher prior to a 1-month trip to the tropical Singapore and Malaysia. During that trip, I had four punctures, all successfully sealed by the Silca sealant. Other than one puncture that lost about 20 PSI and required a mid-ride inflation, the sealant plugged the other three punctures with negligible tire pressure loss. I know the exact tire pressure because I have the Quarq TyreWiz tire pressure monitor installed.
Recently I have an issue with the rear hub of my Enve wheel that requires the wheel be shipped back to Enve for service. So that presented an opportunity to examine the Silca sealant in that wheel. Upon dismounting the tire - almost three months after adding the replenisher - there appeared to be sufficient sealant to perhaps last a couple more months. There was zero sign of carbon fiber balls so the initial bottling issue that caused this appears to have been resolved.
So far, with the Silca ultimate tubeless sealant, even those initial batches that had a tendency to form carbon fiber balls, I have not had a…