New bike, tubeless tire will not inflate I got a new road bike with tubeless tires. I can't get the back tire to hold air. I got the front tire inflated but for some reason, as I am pumping the air all I hear is it coming out somewhere from the tire. I don't see a hole. It was shipped from another state and it came  completely flat.
There could be many causes for a flat tubeless tyre, especially on first installation.


Check the tyre is actually tubeless compatible
Check the tyre beads are seated the whole way round
Check the nut on the valve is tightened (finger tight)
With the wheel off the bike, shake the wheel and listen for sealant.


If any of these conditions are not met, rectify the problem before trying again.

If they are all met, then you have a hole in the tyre - not at all unheard of in tubeless ready tyres which are designed for use with sealant.

To find the hole, get a helper to operate the pump for you, whilst you carefully inspect/listen to where the air is escaping.  Whilst still pumping (to generate some air pressure), rotate the wheel so the hole is at the bottom.  This will cause the sealant to pool in that area and plug the hole.