Magic Milk Tubeless-Pro Hi-Fibre sealant bottle — front view

Magic Milk Tubeless-Pro Hi-Fibre sealant bottle — back view

Magic Milk Tubeless-Pro Hi-Fibre sealant in use — MTB, gravel and road tubeless riding

Magic Milk Tubeless-Pro Hi-Fibre sealant — full bottle range

Magic Milk Tubeless-Pro Hi-Fibre

Q: How much sealant do I need per tyre?

Road 30-50ml. 26" MTB 60-80ml. 27,5" MTB 80-100ml. 29" MTB 100-120ml. Downhill 100-140ml.

🇬🇧 Made in the UK

£17.99

AON Racing run it. SCOTT-SRAM switched to it after Nino Schurter spent a year testing both. Tubeless-Pro Hi-Fibre is ammonia-free synthetic latex with quick-seal fibres — it handles pressures from 15 psi on a DH run to 120 psi on the road, seals punctures up to 8 mm, and stays liquid for 6+ months without balling up.

Size: 250ml

Quantity:

Tested and used by:

Product Features

Tested in Downhill, Enduro, MTB, road and gravel
Synthetic latex — no ammonia, non-allergenic
Fibres stay in suspension — no balling up, just top up and ride
Compatible with CO2 and foam inserts
Safe for tyres and rims
Seals up to 8 mm punctures

Expect Magic Milk to stay liquid for 6+ months (hot climate: 3+) before you need to top up. For tubeless tyre systems. For MTB innertubes, use Magic Milk Innertube-Pro Hi-Fibre.

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: 15–120 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

250 ml

The 250ml bottle is the ideal size for two wheels of any bike, or stow in your car for emergency top-ups. It fits perfectly with your Presta and Schrader valve systems, so you're always prepared. This size ensures you can make quick repairs without missing a beat, and it’s compact enough to fit easily in your ride pack or tool kit.

Usage Info

For use with removable-core Presta, and all Schrader valves.
Expect Magic Milk to stay liquid for 6+ months (hot climate: 3+), before you need to add more.
For Tubeless tyre systems (For MTB innertubes, use
Magic Milk Hi-Fibre Innertube)

Dosage & Quantities

Road 30-50ml
26" MTB 60-80ml
27,5" MTB 80-100ml
29" MTB 100-120ml
Downhill 100-140ml

Sealant Applications

The OKO Nozzle
With the OKO Nozzle, applying the sealant is quick and easy, ensuring you get the perfect amount where it’s needed, with no mess or waste. This nozzle makes it effortless to seal punctures and get back to enjoying your ride, without any delay or fuss.

The OKO Cap

Fitted with OKO's patented Cap technology, an industry first, applying sealant has never been easier. After three years of development, the OKO Cap utilizes the latest material technologies to fit seamlessly with your valve system. In the workshop on or on the go, outfitting your tyres with bike sealant's best kept secret couldn't be easier.

The OKO Cap

Fitted with OKO's patented Cap technology, an industry first, applying sealant has never been easier. After three years of development, the OKO Cap utilizes the latest material technologies to fit seamlessly with your valve system. In the workshop on or on the go, outfitting your tyres with bike sealant's best kept secret couldn't be easier.

The OKO Cap

Fitted with OKO's patented Cap technology, an industry first, applying sealant has never been easier. After three years of development, the OKO Cap utilizes the latest material technologies to fit seamlessly with your valve system. In the workshop on or on the go, outfitting your tyres with bike sealant's best kept secret couldn't be easier.

The OKO Injector

To make application even easier and more efficient, the OKO Injector system (sold separately) is the perfect tool for larger quantities. This injector allows for quick, precise application with minimal mess, meaning you can top up tyres in seconds, ensuring a seamless experience for both technicians and riders. The easy-to-use injector makes it simple to apply the right amount of sealant each time, saving time and reducing waste, so you can keep your operations smooth and efficient.

Frequently asked questions

How much sealant do I need per tyre?

Road 30-50ml
26" MTB 60-80ml
27,5" MTB 80-100ml
29" MTB 100-120ml
Downhill 100-140ml

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.

Reece Wilson racing for AON Racing — Magic Milk official tyre sealant

AON RACING · OFFICIAL SEALANT

SYNTHETIC LATEX WITH QUICK-SEAL FIBRES

Most tubeless sealants patch small holes and hope. Tubeless-Pro Hi-Fibre uses a synthetic latex base loaded with quick-seal fibres held in suspension. When a puncture opens, the fibres pack the hole and bind — a durable seal, not a temporary plug. It holds at -20°C. It holds at +50°C. It holds under hard braking and sharp cornering.

SEALS UP TO 8 MM

Works from 15 psi to 120 psi — DH and enduro low-pressure runs, road and gravel high-pressure. Seals punctures up to 8 mm. Ammonia-free, non-allergenic, CO2 and insert compatible, safe for tyres and rims. Fibres stay in suspension — no clumping, no settling at the bottom.