Originally Posted by bcoz
Sounds like you have a slow leak.
Is it an RFT (run-flat)? If so, you may be able to repair it providing there's no damage to the sidewall.
Yes my tires are RFTs. Are these common on Run flats?
Originally Posted by John_01
Your air pressure is low. Especially the front. I'd recommend around 34 to 38PSI. There are many possibilities for where the air can leak. The most common is just your normal puncture / slow leak. A decent tyre shop should be able to sort it out.
I just follow recommended tire pressure on the door jamb. For a full car with no luggage, it says 29 psi front and 33 rear.
Im using 18" by the way.