Tyre sealant works by suspending a material in a liquid. When a puncture happens the air pressure carries the sealant to the site of the damage and the material gathers there, clogging up the hole.
Stans have long been the go-to tubeless sealant brand and, despite growing competition, continue to impress us with their products. The ‘Race’ version of their sealant contains twice the number of crystals as normal Stan’s, meaning more sealing capability and quicker sealing… in turn meaning less loss of pressure.
The only downside of this is that it must be poured directly into the tyre and can’t be injected or squirted through a valve as it will clog. This can make set up a little more messy and means you have to unseat your tyres to use it, but otherwise it isn’t too much of an issue.
In use, Stans NoTubes Race Sealant really is hard to fault. It has more than lived up to its promises over the last year of bike parks, local laps and gnarly secret trails in South Wales.
Testing multiple bikes that turn up with tubes and also testing wheels and tyres means that I do a lot of tyre faff and have used 3 or 4 bottles in the past year. In that time I’ve literally only had one puncture that would not seal with Stan’s Race Sealant installed. I’ve frequently removed tyres to find big ‘clots’ of sealant covering punctures that I had never even noticed.
At £34.99 a bottle, Stans is more expensive than many other sealants out there, but for peace of mind and the level of protection I think it’s very good value. That’s partly because it’s so effective but also because you can use less sealant in each tyre than you usually would, making the bottle go further.
If I was spending my own money on sealant – I would buy Stan’s Race.