As title said, nearly new firestone tire on 17" ADR rim suddenly started leaking air.
I don't see any bent on rim, an idea what it could be?

 

happened on a few of my older cars. took it to a tire shop and they re sealed the part where it meets the rim. solved for $5

 

get a spray bottle and mix dish soap and water. Spray all over the tire, make sure to get the bead and the valve stem and just look for the bubbles.

 

Could be the valve stem leaking.

You might not have a nail that you can notice, but if you have a small puncture you may not be able to notice it, grab a bottle of soapy water and spray it on the tire, when you see bubbles you have found your leak!

 

more and likely right at the stem if you havent punctured it.

 

check tire bead and make sure it sits right by dunking it in a tub of water. check for bubbles, the usual. also check sidewall for small tears and the valve stem for leaks.

if theres a problem, take it back to the place you got your tire from and have them deal with it.

 

Basically as everyone already said, break down the bead and try to reseal, as well as replace the valve stem (if you don't want to dunk the tire and check for a leak yourself). I've seen many a time where there's a very slow leak that you can't really tell from dunking the tire, and generally resealing the bead and replacing the valve stem fixed it.

 

Screw all that. Just take it to the shop and let them fix it. It's their problem, really.

 

I agree, take it back to the shop and let them do all the work. On a side note, i also recently had a slow leak and i also did not see a problem with the tire or wheel. Took it to the shop and the tire had 4 nails embedded in it.

 

Thanks a lot for the advice,
One of the rims cracked from inside but other wheel was leaking air from valve stem. The shop wheel works, didn't repaired that essentially they wanted to sell me 800$ rim package otherwise they didn't had appointment for fixing valve stem. I not stepping foot in wheel works again.