Noticed one wheel kept leaking down slowly. After a couple of weeks of filling the air in the tires, it was down near the warning pressure again on one rear wheel. Decided to remove the wheel to inspect the cause of the leak. Upon removal of the wheel, there were two noticeable cracks on the inner bead diameter of the wheel. I know this has been a big issue for all the C7 GS corvettes, because this is my 4th C7 GS with the same issue. All my previous C7 GS have had all the factory rear wheels to crack. I don’t understand why there has not been a recall since every C7 GS I’ve owned had this same issue on all the rear wheels. I typically do my own repairs unless they are covered under warrant. I have worked on automobiles for over 35 years in my personal garage and it has become an expectation that any C7 GS or Z06 with a rear tire leaking is caused by a cracked wheel. Have contacted Rick Hendrick City Chevrolet in Charlotte NC about the cracked wheel before deciding repair method that will be taken.