Two of the four wheels were losing air and tested locally. it was determined air was leaking from each of the two rims in a similar location. note-air was not leaking from the tire or the seal between the tire bead and rim. instead, the rim itself appears to have a latent defect causing a slow leak. i contacted a local gmc dealer to see about warranty coverage or manufacture interest in assisting with this safety issue. vehicle is out of warranty and gm was willing to participate at 10% of new replacement cost, see attached. two of the four rims were tested for the defect. both rims exhibit the same defect. that 1/2 of the rims on my one truck are leaking, it suggests a larger defect in the standard rims. i am concerned about motorist safety resulting from defective rims.