How to Set Up Tubeless Tyres Properly

 

 

A North Devon Mechanic’s Step-by-Step Guide (From Dan’s Bike Workshop)

If you ride around North Devon — whether that’s local lanes, gravel tracks, woodland trails or the Tarka Trail — a good tubeless setup can be the difference between an enjoyable ride and standing at the roadside dealing with a puncture.

I set up tubeless tyres almost daily here at Dan’s Bike Workshop in Braunton, and while tubeless isn’t complicated, most of the problems I see come from small mistakes early in the process. This guide walks you through exactly how I set up tubeless tyres, step by step, using the same approach I use in the workshop.

This is written for home mechanics, riders who want to understand their bikes better, and anyone who wants to avoid the usual tubeless headaches.

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Why Go Tubeless? (Especially in North Devon)

Tubeless tyres let you:

• Run lower pressures for comfort and grip

• Reduce the risk of punctures

• Seal small thorns and debris automatically

• Avoid pinch flats on rough lanes and trails

Around Braunton and North Devon, that matters. Our roads and tracks are a mix of sharp gravel, hedge cuttings, flint and rough tarmac — all things tubeless deals with far better than inner tubes.

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Step 1: Clean Everything First (Don’t Skip This)

The first thing I always do is clean off all old sealant from:

• Inside the tyre

• The rim bed

Old sealant often dries into a rubbery layer and sticks to both surfaces. If you leave it there:

• Rim tape won’t bond properly

• Air leaks become more likely

• Old and new sealants can react with each other

Take your time here. A clean rim and tyre give you the best possible start and make every step after this easier.

Workshop tip: If tubeless keeps failing, 9 times out of 10 it’s because this step was rushed. For cleaning we use Muc-off Sealant Remover.

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Step 2: Apply the Rim Tape Correctly

Choose the right width

Rim tape must match your rim width. Tape that’s too narrow might cover the spoke holes, but it won’t seal the edges of the rim — and that leaves almost no margin for error.

The tape should:

• Reach right to the outer edges of the rim bed

• Sit flat with no wrinkles

Apply with tension

When fitting the tape:

• Keep constant tension on it

• Work slowly around the rim

• Overlap the tape by at least 5 cm once you’re back at the start

That overlap prevents the end lifting later and creating a slow leak.

Press it down properly

Once the tape is on:

• Run your thumb firmly around both outer edges

• Then press down the centre channel

This pushes out trapped air and helps the tape seal tightly against the rim.

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Step 3: Fit the Tubeless Valve (Don’t Overthink It)

This is where people often make things harder than they need to be.

How to make the valve hole

After the tape is fitted:

• Use the tubeless valve itself (or an old valve)

• Push it straight down through the tape from the top

• Line it up with the valve hole in the rim

You do not need to cut the tape or make a neat hole. Pushing the valve through creates the correct-sized opening and keeps the seal tight.

Fitting the valve

• Push the valve fully through

• Keep pressure on the valve from above

• Fit the lock ring and tighten by hand only

That’s it. No tools, no torque, no forcing it. Over-tightening can damage the rim or distort the rubber seal.

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Step 4: Fit the Tyre and Add Sealant (The Clean Way)

Instead of adding sealant through the valve, I find this method cleaner and more reliable.

Mount the tyre

• Fit the tyre as you normally would with a tube

• Stop when you reach the point where the last section needs more force

At this point, you’ll have a small gap at the bottom of the tyre.

Add the sealant

• Pour the tubeless sealant directly into that gap

• Rotate the wheel so the sealant drops to the bottom

Now the open section of tyre is at the top, making it easier and less messy to finish fitting the bead.

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Step 5: Seat the Tyre Properly

To seat the tyre:

• Remove the valve core from the tubeless valve

• Use a CO₂ canister or compressor for a strong burst of air

That initial surge is what helps the tyre pop onto the bead seat.

Once the tyre is seated:

• Reinstall the valve core

• Inflate the tyre normally

Even if it drops slightly at first, the bead is already in place — which is the hard part done.

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Step 6: Final Checks (This Is What Makes It Reliable)

This step is key if you want a setup that lasts.

Inflate to maximum PSI

Pump the tyre up to the maximum recommended pressure (printed on the sidewall). This:

• Forces sealant into tiny gaps

• Reveals any leaks straight away

Distribute the sealant

• Hold the wheel by the axle

• Spin it horizontally so sealant coats the bead and sidewalls

• Flip it and repeat on the other side

Let it rest

If possible, leave the tyre for a few hours. This gives the sealant time to fully do its job before you ride.

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Common Tubeless Problems I See in the Workshop

From years of setting up tubeless tyres in Braunton and across North Devon, these are the biggest causes of failure:

• Rim tape too narrow

• Old sealant left in the rim or tyre

• Valve hole cut instead of pushed through

• Not inflating to max PSI initially

• Rushing the final sealing stage

Get those right, and tubeless becomes very reliable.

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Need Help With Tubeless Setup in North Devon?

If you’d rather have it done professionally — or if you’ve tried and it’s just not sealing — I set up tubeless tyres regularly at at our Braunton bike Shop covering North Devon.

Whether it’s:

• First-time tubeless setup

• Fixing slow leaks

• Refreshing old sealant

• Diagnosing stubborn tyres

I’m always happy to help.