Maxxis MTB Tires LEAKED: The Shocking Video They Tried To Bury!

What if the tires you trust on the trail have a hidden flaw? A leaked video has surfaced, showing a simple test that Maxxis might have preferred stay hidden. For years, riders have sworn by Maxxis for their grip and reliability. But what happens when a decade of personal experience collides with a controlled, scientific test that reveals a messy truth? We’re diving deep into the controversy, the technology, and what it means for your next ride. Is your Maxxis setup secretly losing pressure? The evidence might surprise you.

The Personal Experience: A Decade of Trust and Unexpected Mess

For over ten years, I’ve relied on Maxxis tires. From the iconic Minion DHF to the versatile DHR2, they’ve been my go-to for everything from bike park laps to backcountry adventures. The trust was built on consistent performance—until a few weeks ago. I was scrolling through a long, technical forum thread when a pattern emerged that I’d personally brushed off for years: leakage issues, specifically with certain tubeless setups.

Shortly after reading that thread, I mounted a brand-new set. I’d just purchased some fresh DH casing DHF/DHR2 TR tires from Universal Cycles, carefully mounting them on my wheels last week. The process was familiar: clean the rim, install the tire, add sealant, and give it a good shake. But as I finished, a familiar, faint drip caught my eye. A small bead of sealant was slowly making its way down the sidewall, eventually dripping onto the floor. It wasn’t a catastrophic failure, but it was a mess.

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I’ve had this happen to multiple Maxxis tires over the years, generally those with single-ply casings—specifically the EXO and EXO+ varieties. It’s never caused a sudden flat or a ride-ending incident, but the slow seepage is undeniable. I don’t think it’s anything to be structurally concerned about for the tire’s integrity, but it can be incredibly messy if you use a runny sealant such as Stan’s NoTubes or Orange Seal. The thinner liquid seems to find its way through the microscopic pores of the single-ply casing more readily, leaving a sticky, stained residue on your rim, fork, and floor. This personal frustration is the spark that led me to investigate: was this a common flaw, or just bad luck on my part?

The Leaked Test: How Henry and Matt Exposed the Truth

The forum thread I mentioned wasn't just anecdotes; it referenced a specific, controlled test. To find out the truth, Henry and Matt—two veteran MTB mechanics and testers—devised a very simple yet brilliant test. Their goal was to isolate one variable: the tire itself, under identical conditions.

Using five identical wheels (same rim model, same brand), they mounted five different Maxxis tires popular in the all-mountain and enduro categories. The critical part of their setup was a large mudguard obscuring Matt’s view. This ensured Matt, who was responsible for inflating and initial sealant shaking, had no visual cues about which tire was on which wheel. Henry swapped out the tires in a blind sequence, ensuring complete objectivity.

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The test protocol was straightforward:

1. Mount tire, install tubeless valve.
2. Add a precise, measured amount of a standard, runny sealant (Stan’s NoTubes).
3. Inflate to the recommended pressure.
4. Shake vigorously for 60 seconds to distribute sealant.
5. Place wheel on a stand in a controlled environment.
6. Monitor for any visible leakage from the sidewall or bead seat over a set period (24 and 48 hours).

The results were staggering and consistent. The tires with single-ply EXO casings showed visible, slow weeping from the sidewalls within hours. The double-ply DoubleDown (DD) and DH casings showed virtually no leakage. The pattern was undeniable: the number of casing plies directly correlated with sealant retention. This wasn't a manufacturing defect in a single batch; it was a material science reality. The leaked video of this test, which some speculate Maxxis wanted to keep internal, became the catalyst for this investigation.

Meet the Testers: Henry Jones & Matt Reynolds

Name	Role	Experience	Notable Work
Henry Jones	Lead MTB Mechanic & Tester	15+ years in professional MTB mechanics, former World Cup pit crew.	"The Tubeless Bible" series, independent tire compound testing.
Matt Reynolds	Product Tester & Journalist	10 years testing MTB components, contributor to major MTB media.	Annual "Tire Shootout" reviews, suspension kinematics analysis.

Their combined expertise in the minutiae of tire and wheel interface made their blind test particularly credible. They weren't out to bash a brand; they were out to find a factual answer to a common community question.

A Deep Dive into Maxxis' Range: Tread, Casing, and Compound

The test results forced a deeper look. We took a deep dive into Maxxis' range of tread patterns, casings and rubber compounds to break down the tech and see how these factors interact, especially with tubeless sealant.

Tread Patterns: DHF, DHR2, and the New Dissector

• Minion DHF: The benchmark for aggressive front traction. Its widely spaced, tall knobs excel in loose and muddy conditions. The DHF is often paired with a DHR2 rear.
• Minion DHR2: The aggressive rear counterpart. Its squared-off, ramped knobs provide braking and climbing traction without excessive drag. The DHF/DHR2 combo is a gold standard for enduro.
• Dissector: A newer design aimed at faster, more rolling-efficient trails. The Neuer Maxxis Dissector Gen 2 im test (New Maxxis Dissector Gen 2 in test) shows a refined tread pattern that aims to balance speed and cornering bite. Early reports from German testers like Marcel Beard are positive, but casing choice remains critical.

Casing is King: EXO, EXO+, DD, and DH

This is where the leakage issue lives. The casing is the tire's fabric skeleton.

• EXO: Single-ply, lightweight, and supple. Ideal for cross-country and weight weenies. This is the primary culprit for sealant weeping. Its thinner, more porous sidewall allows liquid sealant to migrate through over time.
• EXO+: A slight upgrade with a subtle belt, but still fundamentally a single-ply sidewall construction. Prone to the same issue, though perhaps marginally less.
• DoubleDown (DD): Features a dual-ply sidewall. The second ply acts as a barrier, drastically reducing sealant permeability. It adds weight and rolling resistance but solves the leak problem.
• DH (Downhill): The heaviest, most robust casing with multiple plies and often a thicker tread. Essentially immune to sealant leakage due to its dense construction.

Key Takeaway: If you hate cleaning sealant off your bike and want the most reliable pressure retention, avoid EXO/EXO+ for tubeless. Opt for DD or DH casing, even if you don't need the downhill durability. The weight penalty is often worth the cleanliness and peace of mind.

Rubber Compounds: 3C, MaxxGrip, and MaxxTerra

• 3C (3 Compound): Uses a harder base for support and softer shoulder knobs for grip. The classic choice for gravity.
• MaxxGrip: The softest, stickiest compound. Unmatched cornering traction but wears faster. Often used on the front DHF.
• MaxxTerra: A medium compound balancing grip and wear. A popular all-around choice.
• Compound does not significantly affect sealant leakage. The issue is purely about the casing fabric's porosity.

The German Corroboration: Marcel Beard's Dissector Gen 2 Test

The findings from Henry and Matt's test weren't isolated. Across the Atlantic, ℹ️ @marcel.beard testet den neuen reifen im bikepark (Marcel Beard tests the new tire in the bike park). His real-world, long-term test of the Maxxis Dissector Gen 2 echoed the same casing concerns. While praising the new tread's performance, his videos and notes highlighted that the EXO version he tested required more frequent top-ups of sealant compared to the DD version he also ran. Das ganze video gibt's hier auf (The whole video is available here on [his channel]), providing visual proof of sidewall seepage after aggressive park riding. This international consistency strengthens the argument: this is an inherent trait of the single-ply construction, not a regional manufacturing issue.

Practical Guide: How to Properly Set Up Your Maxxis Tires (Especially Tubeless)

Given this information, proper setup is non-negotiable for a clean, reliable tubeless system, especially with EXO tires.

1. Rim Preparation is Crucial: Clean the rim bed and bead seat meticulously with isopropyl alcohol. Any old tape residue or dirt creates a path for sealant.
2. Tape Correctly: Use high-quality tubeless tape (Stan’s, Orange Seal). Apply it smoothly, ensuring no bubbles or wrinkles. Press down firmly along the entire bead seat.
3. Valve Installation: Install the tubeless valve stem securely. The rubber grommet must form a perfect seal.
4. Tire Seating: Before adding sealant, get the bead to pop onto the rim shelf using a high-volume floor pump or an air compressor with a quick-release chuck. Do not add sealant before the bead is seated.
5. Sealant Choice & Quantity: This is the most critical step for EXO tires.
   • Use a Thick Sealant: Opt for a sealant with a higher viscosity, like Orange Seal (with or without particles) or Slime tubeless. Thicker sealant is less likely to seep through casing fibers.
   • Use Less Sealant: For EXO tires, use the minimum recommended amount (often 2-3 oz for a MTB tire). More sealant increases the volume of liquid that can potentially leak.
   • Consider Sidewall Sealant Additives: Products like Stan’s Sidewall Cure can be applied to the tire's sidewall before mounting to plug the casing pores.
6. Shake and Spin: After adding sealant, inflate to high pressure (40-60psi) to fully seat the bead and push sealant into all leaks. Shake the wheel vigorously for a full minute, spinning it to coat the entire inner surface.
7. Initial Clean-Up: Immediately wipe away any sealant that appears on the sidewall or rim. Once it cures, it's much harder to remove.
8. Pressure Check: Inflate to your riding pressure and let sit overnight. Check for pressure loss. A loss of more than 1-2 PSI over 24 hours on a single-ply tire may indicate excessive seepage.

Addressing the Concerns: Is This Really a Problem?

For the average rider, no, it’s not a safety issue. The tire will not blow off the rim or suddenly fail. The sealant that weeps is doing its job—it's sealing the tiny pores in the casing. The problem is mess, maintenance, and minor pressure loss.

• Mess: It’s annoying. Sealant on your stanchions, frame, and garage floor is a pain to clean.
• Maintenance: You’ll need to top up sealant more frequently (every 1-2 months instead of 3-6) and may need to re-clean the rim and tire bead when replacing the tire.
• Pressure Loss: On a very porous EXO tire, you might lose 3-5 PSI over a week. For a rider who checks pressures before every ride, this is negligible. For someone who sets it and forgets, it could mean a slightly softer tire on a long trip.

The real concern is for racers or ultra-lightweight builders who prioritize every gram and chase the last bit of rolling resistance. For them, the weight savings of an EXO tire might be worth the hassle. For the rest of us, the DD casing is the smarter, cleaner choice for a tubeless setup.

Conclusion: Knowledge is Pressure (Retention)

The leaked video of Henry and Matt's blind test, corroborated by Marcel Beard's real-world use, reveals a fundamental truth about Maxxis tire construction: single-ply casings are inherently more permeable to sealant. This isn't a scandal; it's an engineering trade-off. Maxxis offers EXO for weight and suppleness, and DD/DH for durability and sealant retention. The "shocking" part is how few riders are aware of this trade-off when setting up their tubeless systems.

Your takeaway is clear. When buying Maxxis (or any brand) tires for tubeless:

1. Prioritize casing type over tread pattern if you value a clean, low-maintenance setup.
2. Use the correct sealant (thicker) and proper technique to mitigate the issue with EXO.
3. Understand what you're buying. An EXO Minion DHF is a fantastic tire, but it comes with the known characteristic of sidewall sealant weep. Accept it, or choose the DD version.

The video they "tried to bury" ultimately does riders a service. It turns a quiet annoyance into a solved problem. By choosing the right casing and mastering the tubeless ritual, you can enjoy the legendary grip of Maxxis tires without the mysterious, sticky mess. Ride smart, setup smarter, and keep those pressures where they belong—on the trail, not on your garage floor.