Muc-Off MTB Tubeless Tire Sealant - 140ml Pouch
Tubeless & Flat Repair
Muc-Off MTB Tubeless Tire Sealant - 140ml Pouch
Muc-Off MTB Tubeless Tire Sealant - 140ml Pouch
Muc-Off MTB Tubeless Tire Sealant pairs an advanced latex that forms a strong seal fast with sealing particles that fill bigger holes and tears. Read the overview
At a glance
- Format
- Pouch, fits Presta valve
- Volume
- 140ml
- Seals punctures
- Up to 7mm
- Fill chart
- 26/27.5, 700c CX, 29, DH
4 in stock
Free shipping on US orders over $100.
- 30-day returns in new condition. Read the return policy.
- Price matching. Found it for less? See how it works.
Overview
How Does Muc-Off MTB Tubeless Sealant Seal Punctures?
Muc-Off MTB Tubeless Tire Sealant pairs an advanced latex that forms a strong seal fast with sealing particles that fill bigger holes and tears. It seals tears and holes up to 7mm, and it also seals porous tires and bead and rim gaps.
The 140ml pouch is designed to fit right over a Presta valve, and fill lines on the pack show how much to add for your tire size. Muc-Off made the pouch to add to your toolkit or ride pack for emergency top-ups on the go. Muc-Off's fill chart covers 26 and 27.5 inch MTB, 700c cross, 29 inch MTB and downhill tires.
All the specs
MPN 821
- Volume
- 140ml
- Format
- Pouch with fill lines, fits Presta valve
- Seals punctures
- Up to 7mm
- Fill chart sizes
- 26/27.5 MTB, 700c cross, 29 MTB, downhill
- Formula
- Advanced latex with sealing particles, ammonia free
FAQ
Good questions
Get to know Muc-Off

There's more to Muc-Off than this one product. Our Muc-Off page has the full Muc-Off lineup we carry and more about the brand.
Visit the Muc-Off page →How do I inject the sealant from the pouch?
Remove the valve core and shake the pouch well. With the valve at 12 o'clock, push the pouch over the valve, then rotate the wheel until the valve is at 6 o'clock and squeeze sealant in, folding the pouch to the fill line for your tire. Reinsert the core, inflate, then spin the wheel and rock it side to side to spread the sealant.
How often should I top up tubeless sealant?
Muc-Off rates it to last up to 6 months or more in temperate climates. Check the amount in each tire regularly and top up as needed, especially in hot, dry riding above 35°C or every 750 miles.
Is 140ml enough for a full MTB tire conversion?
It depends on your tire size. Muc-Off's minimum per tire is 60 to 75ml for 26 and 27.5 inch MTB tires, 105 to 140ml (or the whole pouch) for 29 inch MTB tires, and 120 to 140ml (or the whole pouch) for downhill tires. You can add up to 30ml extra for more protection.
Reviews
What riders say about the Lab
“Paul does a great job. He got my bike I bought from someone there in their town and had it packed and shipped to me in Austin, TX… It got here in perfect condition!”
“Fantastic store. It has everything you may want/need for cycling. Great team. Highly recommend to anyone looking for cycling related things and bike service.”
“I recently got back into biking and wanted to add some things onto my bike. They had most of what I was looking for in shop… I'm really happy to have found them.”
Questions about this one?
Not sure on size, compatibility, or whether this is the right one for you? Ask us. A real person here will answer.
Goes straight to the Lab with the product you were looking at attached. No newsletter signup.

