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How Do You Find a Tire Bead Leak?

Spray the full line where the tire meets the rim, inner and outer, and watch for bubbles that keep forming in one arc. Mark it, demount,

3 min read CHAOS Moto

To find a tire bead leak, inflate the tire, spray Bubble Check all the way around the line where the tire meets the rim on both sides of the wheel, and watch for bubbles that keep forming along that line. A bead leak usually shows as a cluster or a thin chain of small bubbles at the rim flange, often in one arc rather than all the way around. Mark the arc, then demount the tire and clean and inspect the bead seat.

Find your leak in 3 taps: Leak Lab →
Wheel diagram: dashed red ring where the tire meets the rim, with bubbles forming along one arc of it Bead leakSPRAYFull circle where tiremeets rim, both sidesLOOK FORSmall bubbles buildingalong one arcNEXTMark it, demount, cleanand inspect the bead seat
Bead leak: spray the whole tire-to-rim line on the outer and inner side. Bubbles usually gather in one arc.

How does it show up?

  • The tire loses pressure slowly over days or weeks, with no nail in the tread.
  • It comes back after a tire change or on an older alloy wheel with corrosion at the bead seat.
  • It gets worse in cold weather, when the rubber is stiffer.
  • It may be on the inner bead, the side that faces the car, which is easy to skip.

Where do you spray Bubble Check?

  • The full circle where the tire bead meets the rim flange on the outer face.
  • The same circle on the inner side. Lift the vehicle or pull the wheel to reach it.
  • Turn the wheel so every part of the bead line gets sprayed and watched.

What do the bubbles look like?

  • Fine foam or a chain of small bubbles right at the edge where the rubber meets the rim.
  • Bubbles that keep building in the same arc, not a single bubble that pops and stops.
  • A fast bead leak can push the liquid into a growing mound of foam.

What do you do next?

  1. Mark the arc with a tire crayon on both the tire and the wheel.
  2. Demount the tire.
  3. Inspect the bead seat for corrosion, old rubber, debris, and damage, and the tire bead for cuts or distortion.
  4. Clean the bead seat with a method suited to the wheel finish.
  5. Remount with fresh mounting lube, and bead sealer where your shop's practice calls for it.
  6. Inflate and spray the bead again to confirm the leak is gone.

How to run the check

  1. Inflate the tire to its specified pressure. A soft tire may not push enough air to show a slow leak.
  2. Spray Bubble Check on the area and give it time. A slow leak can take a little while to show.
  3. Watch for bubbles that keep forming at the same point. The first light foam from the spray settles; a leak keeps building.
  4. Mark the spot with a tire crayon before you wipe the area dry.

About Bubble Check

Bubble Check is the CHAOS Moto spray-on tire leak detector. It comes in a 32 oz bottle with a trigger sprayer, so you check the tire on the wheel with no dunk tank needed. Shops use it to pinpoint valve and bead leaks and for TPMS stem checks. See the Bubble Check page or where to buy. Bubble Check is not currently sold on Amazon.

Common questions

Can a bead leak be fixed without taking the tire off?

Not reliably. Cleaning the bead seat means breaking the bead. Finding the arc first tells you where to look once the tire is off.

Why does a bead leak come back after a remount?

Corrosion or debris left on the bead seat, or damage to the bead or the rim flange. Clean and inspect both before remounting.

Do you need a dunk tank to find a bead leak?

No. Bubble Check is sprayed on the tire while it is on the wheel, so you can check the whole bead line in the bay.

More leak types in the Leak Lab. Related: wheel porosity or a cracked rim and when you cannot find a slow leak. Questions: sales@chaosmoto.com or 480-829-7888.

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