Checklist for UST and Tubeless Tires

Like a modern automotive or motorcycle tire, tubeless tires and wheels may need to be submerged in water to detect a leak. A large sink, washtub or bucket will do, as only a portion of the wheel needs to submerged at a time. Inflate the tire to 50+psi, let the naturally trapped air escape from the rim cavity and look for a steady stream of air from the following locations:

Is there air escaping from:

1. The tread?
   UST: It is likely a puncture. Check for holes and objects in the tire.
   Non-UST: It could be a puncture or in need of additional sealant.
2. The sidewall?
   UST: This may be a bad tire. Occasionally UST tires have a sidewall that is too thin.
   Non-UST: It could be a bad tire or in need of additional sealant.
3. The bead?
   Check bead, rim, or seating. Also, are there any inspection stickers at the bead or rim? They must be removed.
4. Valve hole?
   Check the valve. Is it too tight or too loose? Check it. You can switch it with a good or new valve to be sure.
5. Spoke hole?
   This could be a seam or valve. Double-check the valve.
6. No Success?
   Check with the manufacturer.

Notes:

• Tire irons may damage the bead of a UST tubeless tire and therefor these tires should be installed by hand.
• UST tires must be pumped to 60 psi to lock the bead in place.
• Sealants tend to dry or coagulate over time reducing their effectiveness.  Stan’s suggests their sealant last between 2 and 6 months. Check the level of your tire sealant on a regular basis.

The information above was adapted from a file originally provided by Mavic USA.