Reliable tubeless sealant for mountain bikes, enduro and downhill use.
Muc-Off MTB Tubeless Sealant is designed to seal punctures and small tears while you ride, helping keep tubeless tyres inflated without having to stop and fit a tube.
It is suitable for mountain bike, enduro and downhill tyres and can seal holes and tears up to 6mm. The formula is ammonia-free, CO₂-compatible and contains UV dye to help identify punctures and sealant leaks.
It works across a wide pressure range from 15 to 80psi and is designed to perform in temperatures from -20°C to +50°C, making it suitable for a broad range of riding conditions.
Key Features
- Seals holes and tears up to 6mm
- Suitable for MTB, enduro and downhill tyres
- Ammonia-free formula
- CO₂-compatible
- Works between 15 and 80psi
- Operating temperature range from -20°C to +50°C
- UV puncture-detection dye helps identify leaks
- Suitable for tubeless-ready and full UST wheels and tyres
- Available in 80ml, 140ml, 500ml, 1L and 5L sizes
Recommended Sealant Volumes
- 26-inch MTB tyres: 60-75ml
- 27.5-inch MTB tyres: 70-80ml
- 29-inch MTB tyres: 80-100ml
- Downhill tyres: 100-140ml
These are useful starting points. Larger-volume tyres, very porous casings or dry riding conditions may require a little more sealant.
How to Use
- Shake the bottle thoroughly before use.
- Add the recommended amount directly into the tyre during installation or through a tubeless valve with a removable core or suitable straight-through design.
- Inflate the tyre and rotate the wheel to distribute the sealant around the inside of the casing.
- Check tyre pressure and inspect for leaks before riding.
Maintenance
Tubeless sealant does not last forever. How quickly it dries depends on temperature, tyre construction, riding conditions and how often the bike is used.
We recommend checking the sealant level regularly rather than waiting until you get a puncture and discover the tyre is dry. If you ride frequently or through warmer weather, check it more often.
Why Choose Muc-Off MTB Tubeless Sealant?
This is a practical choice for riders who want a dependable sealant for everyday trail riding, enduro or downhill use. The 6mm sealing capability gives useful protection against common punctures, while the UV dye makes it easier to track down small leaks around tyres, rims and valve areas.
The range of bottle sizes also makes sense. Smaller bottles are handy for a single setup or carrying on a trip, while the 1L and 5L sizes are better value if you're maintaining several tubeless bikes.
Our Thoughts
We've found the biggest thing with any tubeless sealant is keeping an eye on it. Most failures blamed on the sealant itself happen because the tyre has dried out and there's nothing left inside when the puncture happens.
For a normal MTB setup, we'd use the recommended amount as a starting point and then check it periodically. Bigger tyres and hard-ridden enduro or downhill bikes generally benefit from having a bit more sealant on board.
The UV dye is useful too. If you've got a slow leak that isn't obvious, it can make finding the problem around the tyre bead or valve area a lot easier.
