[Excellence]

The tires on the trike my daughter gave me last Christmas all have a slow leak. No inner tubes. Is there anything I can do myself without taking the wheels off?

[nh1]

Yes, If the bike is set up tubeless you can unscrew the valve core and add some Stans NoTubes (https://www.notubes.com/). There are other brands, this is the only one I've used.

I use a plastic syringe and add about 2 ounces per tire.

This should seal the tire after you ride a bit.

You may want to do all three as tubeless tires seem to slowly leak over time.

[oldplayer]

You MIGHT be able to add about 8 ounces of bicycle specific sealant. Tubeless tires need to be used weekly to ensure sealant doesn’t dry out.