I have an older aluminum rear wheel that has a continuous line of hairline cracks. The hairline cracks proceed in a circle around the wheel on both sides of the wheel. The front wheel does not display this pattern.
When I search for "cracked wheels" in google or previous questions here on this site, I see damage that appears far more obvious than these subtle lines. On this wheel, none of the spoke holes have any apparent damage and the cracks do not appear to be deep. It could just be paint but I've never seen this before. They make me uneasy as I'm unsure if they are safe.
Are these cracks dangerous to the integrity of the wheel?
I'm referring to the green line.