How to set up tubeless tires

Heads up: we earn a commission if you buy through the links on this page, at no extra cost to you. It never decides what makes the list — here’s how that works.

Everyone who has set up a tubeless tire has a story about the moment it wouldn’t seat — the pump going nowhere, air hissing out as fast as it goes in, sealant on the floor, and a quiet reconsideration of the whole idea. That moment is the actual skill in this job, and it has almost nothing to do with the sealant. It is about getting a burst of air into the tire fast enough to snap the bead into place before the air escapes past it. Understand that one thing and the rest is housekeeping.

The procedure below is Park Tool’s published tubeless method, quoted where it matters, with the common failure modes and the honest note about the mess added around it. Nothing here was bench-tested by us; it is a mechanical procedure explained from published sources, not a product review. If you’re still deciding whether tubeless is worth the faff at all, read tubeless vs tubesfirst — it covers the decision and the running costs before you commit to the setup. This page assumes you’ve made that call.

First: are your tire and rim actually tubeless-ready?

Park Tool’s opening instruction is the one people skip: “verify that your components are tubeless compatible.”This is not a formality. A rim and tire that were never designed to be airtight can sometimes be bullied into holding air with enough sealant — and can also blow off at the worst possible moment. Do the boring check first.

There are two flavours of “tubeless” you’ll see on tires. USTtires have a sealed, airtight carcass and a stiff, tightly-toleranced bead — in principle they hold air with little or no sealant. Tubeless-ready(often marked “TLR”) tires have a lighter, more porous casing that relies on sealant to become airtight. Almost every modern gravel and road tubeless tire is the tubeless-ready kind, which is exactly why sealant is not optional on them. A tire with no tubeless marking at all is a tube-type tire, and it is the one you should not try to convert. For which gravel tires actually ship tubeless-ready in the first place, see our gravel tire guide.

The rim matters just as much, and here there is a hard number you cannot argue with. Many current gravel and road rims are hookless— the rim wall has no small hooked lip to catch the tire bead, so the bead is held purely by shape and pressure. ENVE, documenting the ETRTO/ISO standard, gives the ceiling plainly: the maximum pressure for a hookless setup is 5 bar (72.5 psi), and a tire only earns an “approved” listing on their chart if it can hold 165% of that — 120 psi — without blowing off the rim. Read it the right way round: 72.5 psi is not a target, it’s a ceiling,and it applies even if the tire’s own sidewall says it will take more. If you run hookless, that number is the law of your bike, and it is another reason to start from a tire the rim maker actually approves.

The unglamorous half: rim tape and the valve

Before the tire goes anywhere near the rim, the rim itself has to be made airtight — and this is where most “mystery” leaks are actually born. A tubeless rim needs tubeless-specific rim tape covering every spoke hole in the rim bed, pulled tight and stuck down cleanly, with no wrinkles and no bubbles. One good wrap is usually enough if the tape is the right width for the channel: too narrow and it leaves the edge of a spoke hole exposed, too wide and it rides up the sidewall and stops the bead seating. Then you pierce one small hole for the valve.

The valve pushes through that hole from inside the rim, its rubber cone sealing against the rim bed, and the lock ring snugs it down from outside. Park Tool’s reminder is worth taking literally: “check that the valve is secure in the rim.”A tubeless tire that quietly loses a few psi overnight is, more often than anyone likes to admit, not a leaky tire at all — it’s a valve that isn’t quite tight, or a single spoke hole the tape didn’t seal. Fix the boring things before you blame the tire.

Mounting the tire

Now the tire. Park Tool: “Install one bead on the rim. Install the second bead beginning at the valve. Leave a portion of the bead uninstalled.” That last part only applies if you plan to pour sealant in over the bead — more on the two methods below. As you work, push the bead down into the deep centre channel of the rim; that’s where the slack is, and it’s the difference between finishing the last hard section with your thumbs and reaching for a lever that can nick the fresh bead. If the tire is genuinely tight, Park Tool’s advice is the same as for any stubborn tire: “if it’s a tight bead, it can help to use soapy water and lubricate the bead.”Soapy water is the single most useful thing on the bench for tubeless — it helps the tire go on, and, crucially, it helps the bead slide up and snap into place when you inflate.

The seating problem — why a floor pump sometimes won’t do it

This is the step that defeats people, so it’s worth understanding the mechanism instead of just buying a bigger pump. To seat, the tire bead has to jump outward and lock into the rim’s bead shelf, and it has to do that beforethe air you’re adding leaks back out through the gap between the unseated bead and the rim. It is a race between how fast you can put air in and how fast it escapes.

A floor pump adds air in measured strokes. On a tire with a tight, well-matched bead that’s often enough — you pump hard, the bead pops around the rim with a series of bangs, done. On a looser tire, or a wide gravel tire with a lot of internal volume, each stroke’s worth of air escapes past the bead before the next stroke arrives, and the tire never builds the pressure it needs to seat. You can pump until you’re exhausted and get nowhere. That is not a fitness problem. It’s an airflow-rate problem.

Two things fix it. First, remove the valve core— Park Tool has you do this for the injection method anyway (“remove the core using a valve core remover such as the Park Tool VC-1”) — because the core is a restriction, and taking it out lets air flood in far faster. Second, deliver that air in a burst rather than a trickle. That is exactly what a tubeless booster or “charger” pump does: you pump it up like a spare tank, then dump its whole stored volume into the tire at once. A shop air compressor does the same thing continuously, which is why Park Tool’s injection method simply says to “inflate the tire fully with an air compressor, allowing the bead to fully seat”— the compressor is doing the work a floor pump can’t. Whichever tool you use, Park Tool’s target is the same: “inflate the tire to at least the maximum pressure on the label”to pop both beads fully home — while respecting a hookless rim’s 72.5 psi ceiling if that’s what you’re on.

Adding the sealant — through the valve, or over the bead

There are two honest ways to get sealant in, and Park Tool documents both.

Over the bead (the pour method).You leave a section of the second bead unmounted, pour the sealant straight into the open tire, then — Park Tool — “slowly rotate the wheel to keep the fluid at the bottom while your unmounted bead comes to the top” and finish installing the bead. It’s simple and you can see exactly how much went in. The downside is that you then have to seat a tire already sloshing with liquid, which is messier — every failed seating attempt sprays sealant.

Through the valve (the injection method). You “mount both tire beads to the rim before adding any sealant,” seat the tire dry with the compressor, then remove the valve core and inject the sealant through the valve with a syringe. The advantage is real: you seat the bead clean and dry, with nothing to spray everywhere, and only then add the fluid. This is the method most people settle on the first time they mop a floor.

How much? Follow the tire’s or the sealant’s label — Park Tool just says to “check the label for the recommended amount of tire sealant.”Stan’s NoTubes publishes a volume chart, and for the gravel and road sizes this site covers it lands around 50 – 80 ml per tire (the table below has the exact figures). Once it’s in, distribute it: reinstall the core, bring the tire back to pressure, and — Park Tool — “spin the wheel to move sealant around inside the tire.” Then bounce it, lay it flat on each side for a minute, and spin again. The goal is to wet the entire inner surface, especially the bead seat, where most slow leaks live.

Troubleshooting: burps, weeps and the leak that won’t stop

The bead sits low or uneven.Sight along the tire’s moulding line all the way round — it should sit an even distance above the rim, and where it dips, the bead hasn’t seated. Park Tool’s fix: “Check that the tire bead is correctly seated. In some cases, the bead will be too low. Deflate the tire, break the bead at the low point, and lubricate with soapy water. Reinflate.”

It “burps” — a spurt of air and sealant when you hit something.That’s the bead briefly unseating under a side load, usually because the pressure is too low for your weight or the bead never fully seated in the first place. Getting the bead properly home, and not running silly-low pressures for the load, fixes most of it. Where the running-pressure trade-offs land is its own subject — our tubeless vs tubes piece has the honest version of the costs and benefits.

Sealant weeps through the sidewall.On a fresh tubeless-ready tire this is normal — the casing is porous by design and the sealant is doing exactly its job, filling the weave. Spin it, ride it gently, add a little more if it persists, and it settles. A sealed UST casing does this far less, which is part of what you pay for with UST.

It goes soft overnight but holds when you ride. Suspect the valve and the tape before the tire, as above. Pump it up, spray the valve base and the bead with soapy water, and watch for the bubbles that tell you where the air is going.

The leak sealant simply can’t win.Be honest about the limits: sealant plugs small holes, not slashes, and Park Tool’s published position is blunt — “in general, punctures in tubeless tires cannot be repaired,” with vulcanizing patches viable only on UST and butyl-lined tires. So the tube in your saddlebag is not optional just because you went tubeless. When the sealant loses, the fix is the old one: pull the valve, fit a tube, ride home. Our guide to fixing a flatis exactly what to do when sealant doesn’t save you on the road.

What we haven’t done

We have not bench-tested pumps, sealants or rims. The procedure here is Park Tool’s, quoted and linked; the sealant volumes are Stan’s own published chart; the hookless pressure ceiling is the ETRTO/ISO figure ENVE documents. Everything else is mechanism — where the air goes, where it leaks, and why a burst of air seats a bead that a trickle can’t — which you can verify by doing it yourself. Messily, the first time. Everyone does.