Seating a Tubeless Tire with a Hand Pump

Why seating is harder than normal inflation

A tube-type tire inflates easily because the tube holds the air. A tubeless tire has no tube, so air has to fill the tire faster than it escapes around the bead. A hand pump moves a small volume of air per stroke, so sometimes air leaks out as quickly as you add it. A floor pump is usually more effective than a mini pump, and many riders use a compressor or a tubeless booster tank for stubborn combinations. Still, with preparation, a hand pump can often work, particularly with a well-matched tire and rim.

Preparation

• Check compatibility. Make sure your tire and rim are marked as tubeless compatible. The rim width guide also covers hookless rim requirements.
• Clean the rim and bead. Wipe away dirt and old, dried sealant.
• Check the rim tape and valve. The tape should cover the spoke holes fully and the valve should be tight.
• Seat the tire on the rim evenly, with the bead sitting in the central channel while you fit the last section.
• Have sealant ready. See adding tubeless sealant for how much to use.
• Check your pump head fits the valve, and consider removing the valve core if your valve allows, as it increases airflow. If you do, remember to reinstall it before using sealant through the valve.

Step-by-step

1. Fit the tire and spread a little sealant or soapy water on the bead to help it slide and seal. Follow the manufacturer’s instructions where there are any.
2. Fit the pump head to the valve and make sure the seal is tight.
3. Pump fast and continuously. A rapid flow gives the best chance of pushing the bead outward.
4. Listen for one or two loud pops. These usually signal the bead seating against the rim.
5. Stop and check the bead line, which is the thin molded ring on the sidewall, near the rim. It should sit evenly all the way round.
6. If you removed the valve core, refit it, then inflate to the pressure you need.
7. Check for leaks, and spin and shake the wheel so the sealant coats the inside of the tire.

Do not exceed the maximum pressure on the tire or the rim. Never lean over the tire while it is being inflated quickly.

If the bead will not seat

• Check for a small gap where the tire has not sat on the rim, and push it down by hand.
• Add a bit more soapy water to the bead and try again.
• Remove the valve core to increase airflow.
• Try a different pump, or borrow a floor pump or compressor. A booster tank, if you have access to one, stores pressurized air and releases it quickly.
• Try a different tire position, or fit the tire with a tube temporarily so you can ride home. See inflating a bike tire without a pump for other airflow options.

After seating: sealant and pressure

Once seated, tubeless tires normally need sealant to hold air long-term. Pressure can typically be lower than with a tube, but stay inside the range on the sidewall, and consider the rim manufacturer’s guidance. For general pressure principles, see how to inflate a bike tire properly.

FAQ

How do I pump up a tubeless tire? Seat the bead with a fast burst of air, add sealant, and then inflate to the target pressure.

Is 20 psi too low? That depends on the tire. It can be reasonable for some wide off-road tubeless setups, and too low for narrow road tires. Check your tire and rim limits.

Can I use a CO2 inflator? Some people do, since it gives a rapid burst. See our CO2 inflator guide.