Magic Milk Tubeless-Pro Hi-Fibre
Tested and used by:
Product Features
Sealant Applications
Product Description
Most tubeless sealants patch small holes and hope. Tubeless-Pro Hi-Fibre seals punctures up to 8 mm — in seconds, at any pressure, in any temperature a trail throws at you. It's what AON Racing runs. It's what replaced the previous sealant at SCOTT-SRAM after a year of side-by-side testing. It's tyre sealant's best kept secret.
How it seals
The formula is synthetic latex with quick-seal fibres held in suspension. When a puncture opens and air rushes out, the fibres pack the hole and bind fast — not a temporary plug, a durable seal. It doesn't ball up. It doesn't dry out under hard braking or sharp cornering. It holds.
Specs
- Max puncture sealed: 8 mm
- Pressure range: 0.9–9 bar (13–130 psi)
- Temperature range: −20°C to +50°C
- System: tubeless — MTB, gravel, road
- CO2 compatible
- Non-corrosive — safe for tyres and rims
- Made in the UK
Why synthetic latex
Most tubeless tyre sealants are built on natural latex — which means rubber trees, which means rainforest. Magic Milk uses synthetic latex instead. Same sealing performance. No deforestation. Washes off with water.
Bottle Size
Usage Info
Dosage & Quantities
Frequently asked questions
How much sealant do I need per tyre?
How do I check if the sealant is still active?
Remove the valve core and use a thin probe or zip-tie to dip into the tyre. If it comes out wet, you've still got working sealant. If it's barely damp or dry, top up. You can also stand the wheel up and slowly rotate it — if you hear sealant moving inside, it's still liquid.
Which valves does it work with?
Removable-core Presta valves and all Schrader valves. Don't use it with Presta valves that have a non-removable core — there's no clean way to inject the sealant.
Is it CO2 and foam-insert compatible?
Yes. Works with CO2 inflators and is fully compatible with foam tyre inserts (CushCore, Tannus, Vittoria Air-Liner and similar).
Can I use this in an innertube?
No — Tubeless-Pro Hi-Fibre is for tubeless tyre systems only. For inner tubes, use Magic Milk Innertube-Pro Hi-Fibre.
AON RACING · OFFICIAL SEALANT
TUBELESS SEALANT WITH QUICK-SEAL FIBRES
SEALS UP TO 8 MM
Popular Products
I was after some replacement sealant for my tubeless tyres for my mountain bike. You must ensure that you have tubeless tyres for this product and not inner tubes otherwise this will not work. This bottle offers good value for money and the applicator is easy to use for removing the valve from the tyre, fill with the liquid and replace the valve again. It fit easily to do this. It was a 10-minute job to do once you are familiar with using this. The liquid doesn’t smell strongly of anything and is made from a form of synthetic latex which is better for the environment. It looks and feels like a quality liquid. This gives you peace of mind when out on the trails that you won’t get a puncture and ruin your day out!
Magic Milk Original. Habe mich extra für diese Milch entschieden, da nur gute Bewertungen. Mein Fazit: dichtet nicht mal ein Loch kleiner 1mm! Sehr enttäuscht. Habe ein sehr kleines Loch (<1mm) im MTB-Reifen über der Felge. Alles was passiert ist, das bei Druck um die 2bar es aus dem Loch wie eine Fontäne raus gesprudelt kommt. Wenn man den Reifen so dreht und hält, das die Milch direkt über den Loch ist, dann stoppt es irgendwann man. Man hofft, oh es ist dich. Sobald aber die Belastung auf den Reifen kommt, fängt es sofort wieder an zu zischen und die Luft entweicht. Wie gesagt, das Loch ist vielleicht Nähnadel groß, kleiner 1mm. Wie soll das bei Löchern bis 8mm funktionieren? Und bei Drücken bis 120psi? Vielleicht liest dies ja ein Mitarbeiter und kann man hier eine Rückmeldung geben.
Ich habe nur gutes gehört………. Aber wann öffnet jetzt endlich der online Shop ?????
Brilliant! Big chunks, great packaging, fast delivery.
10/10
The sealant is excellent, but like anything at all cycle tubeless related the cost is a scandal.
Love this stuff! I've been using Magic Milk in my Mountain Bike Tyres for years and it's great. Much less messy than the competition - easy to scoop out when it comes to new tyres as it stays liquid rather than adhering itself the tyre wall. Only needs occasional top ups too.
It’s never let me down… granted I’ve never used a different type, but, if it ain’t broke…
I bought this as a replacement sealant for my tubeless tyres and it does exactly what it promises. It’s important to note that this is for tubeless tyres only, not inner tubes.The application is very easy and mess-free thanks to the clever cap and built in applicator. Removing the valve core, adding the sealant, and refitting it all took around 10 minutes, even the first time. No extra tools or syringes needed, and it works well with Presta valves.The sealant itself feels high quality, with a good consistency that spreads evenly inside the tyre. It has no strong smell, is latex-free, and is safe for carbon rims, which is reassuring. I like that it’s also CO2 compatible, so there are no issues if you need to inflate on the trail.In use, it sealed a small puncture quickly with no noticeable pressure loss, which gives great peace of mind when riding. It’s worked well on my hybrid bike, and it’s nice knowing there’s protection in the tyre just in case. The claim of lasting up to 6 months is a bonus and reduces the need for frequent top-ups, though I’ve yet to test that.All in all, it’s a reliable, easy-to-use tubeless sealant that offers good value for money and does its job well.
Seems to work really well on my hybrid bike. Sorted an existing puncture and it's nice to know there's a bit rolling around in it just in case. Whether it will work in all situations I don't know, but its definitely worth a punt for additional piece of mind.
To begin with i am not an amazon vine customer I paid for my item.Just slight moan about the instructions on the bottle ,I was under the impression the green top was to be placed on the presta valve and then tube attached.The green top is used to take out valve core.
I received this item through the Amazon Vine programme in exchange for an honest review.This tubeless tyre sealant has impressed me both in terms of performance and ease of use. The consistency feels well balanced, not overly watery or thick, and it distributes evenly inside the tyre. After installation, it sealed a small puncture quickly and without any noticeable pressure loss, which is exactly what you want from a reliable sealant.One of the standout features is the innovative cap and built in applicator. Being able to remove the valve core and inject the sealant directly makes the process far cleaner and simpler than many alternatives, with no need for additional tools or syringes. It worked smoothly with Presta valves and was completely hassle free.I also like that the formula is latex free and safe for carbon rims, making it suitable for a wide range of bikes including road, gravel and MTB setups. It gives confidence that it will last for months without drying out too quickly.Overall, this is a high quality, well thought out tubeless sealant that performs exactly as described. Ideal for riders who want dependable puncture protection with minimal mess and effort.
Easy to use from the bottle. Sealed a small puncture from a thorn instantly.
I like that this is a product from a UK company, with its own website.This claims to last for 6months and to be ammonia free, both of which are welcome. It is also Co2 compatible, so there is less sorting out to do if you find you need to use your Co2 pump when out on a ride.The lid has a recessed extending applicator tube which makes it easier to top up your type without spillage.
I like the design of this Magic Milk tubeless sealant.The previous stuff I use has a separate tube to go between the bottle and your valve and it was forever getting lost here. This Magic Milk bottle does away with that problem by having the tube/straw being built into the bottle (just lift it upwards to pull it outwards).This is a real time-saver for me.The screw top comes off and works for both Shrader and Presta valves and like the previous sealant I used it has a sparkle to it so you can keep track of flow in the tubes (there's a volume marker on the side of the bottle to keep track of how much you've used on each tyre.This bottle makes regular topping up really easy and mess free.I tried the 1 litre version, which has enough sealant to keep a family's worth of bike tyres topped up for a while.I can't comment on effectiveness. The viscosity seems about the same as my previous sealant. Time will tell on punctures but the claimed 8mm hole-filling abilities is impressive.Overall 5 stars from me. Nicely designed bottle and good product so far.
I picked up the Magic Milk Tubeless-Pro Hi-Fibre Tyre Sealant (1L) for my MTB and gravel setup, and I’m genuinely impressed. I’ve tried plenty of tubeless sealants over the years, but this one stands out for performance, ease of use, and sheer reliability on the trail.Quick, Clean, and Easy ApplicationThe innovative cap design is a huge win. No more messy pouring, no more trying to balance a wheel while fighting with a bottle. The nozzle makes topping up incredibly straightforward — it actually feels like the product was designed by cyclists who know the struggle.Seals Fast and Stays StrongOut on the trail, this sealant performs exactly as promised. I’ve had two small punctures so far (one on a gravel ride, one on a rocky MTB section), and both sealed almost instantly. No panic, no wobble, no pressure loss. The hi-fibre formula really seems to make a difference — it clots fast and holds tight.Handles Up to 8mm Punctures? I Believe It.You can see the fibres working when a hole seals. It’s thick enough to fill a decent-sized puncture but doesn’t gum up the tyre. It gives exactly the confidence you want when you’re miles from home.CO₂ & Foam CompatibleA small detail, but extremely useful. I’ve used a CO₂ cartridge with this sealant twice and it stayed stable, didn’t clump, and didn’t reduce its sealing performance. That alone puts it ahead of a lot of competitors.Perfect for MTB, Road, and GravelI’ve now used it across:MTB tyres (tough terrain, rocky descents)Gravel tyres (sharp flint, mixed conditions)Road tubeless (high pressure stability)It behaves consistently in every setup.Economical 1L SizeThe bottle is generous enough for multiple top-ups and full tyre swaps. Great value for anyone running several bikes or prepping for a long season.Final VerdictMagic Milk Tubeless-Pro is dependable, easy to use, and genuinely high-performance. It seals quickly, holds pressure beautifully, and the application system is one of the best I’ve used. If you want a sealant that just works — without the mess, clumping, or mid-ride dramas — this is a top-tier choice.Highly recommended for riders of all levels, from weekend gravel explorers to serious mountain bikers.
Huge 1 litre bottle of puncture repairing liquid. As a litre container you wouldn't want to be carrying this in your saddle bag as it's pretty heavy. A very clever applicator that deals with either type of valves on bike tyres and there's enough liquid here to effectively repair punctures 10 times before running out. I've used a different brand before now and was absolutely amazed at its effectiveness so I suspect this liquid (which can repair holes up to 8mm wide) will be equally as good when disaster strikes. In fact you could just add this liquid to your wheel and let it repair punctures before you even realise that you've got them. Needs to be spread around by both rotation of the wheel and oscillation from side to side and will remain as liquid in the wheel for up to six months. Be great for a touuring club .