My tire is leaking and can't figure the reason.
 

I just bought set of rota wheels and tires.
The problem is that driver's side front tire is keep losing air by no reason.
I brought it to tire shop but they don't see any air bubbles when they spray water soap. I think the air is leaking somewhere very slowly. Do you guys think I should buy a new valve? Please give me an advise!!

go trade the car in, she's done!

Could be ..

bead
valve stem
valve
barrel of wheel
welds on wheel
old tire (seepage)


How much is leaking? 1 psi per week? month?

I guess it leaks like 2psi per week. But not sure. Today I checked and it was 30psi(normal psi for my tire is 36psi I think). I will tighten up the valve if it is loosen..Thanks for advise anyway..

if it leaks that slow, those bottle tire sealants might just do the trick.

Hmmm , NO

they spray water soap? wth...go to discount tire... we at least dunk the entire assembly in a tank...but dave pretty much covered everything it could be...